--- highlight: atom-one-dark --- 我正在参与掘金创作者训练营第6期，[点击了解活动详情](https://juejin.cn/post/7134166674160222221/ "https://juejin.cn/post/7134166674160222221/") ## 前言《css 揭秘》这本书以案例的形式，介绍了 47 个网页设计经典难题的解决方案，我在学习之余将其一一记录下来，方便回顾，本文介绍前 19个案例效果及代码。在线预览 [http://play.csssecrets.io](http://play.csssecrets.io/) ## 1-半透明边框介绍：当你用 `rgba()` 或者 `hsla()` ，写了一个半透明的颜色，给到容器边框时候，你会发现，没有半透明效果，这是因为默认情况下，背景色会填充到边框区域，导致边框的半透明效果失效，当把 `border` 样式设置为 dashed 时候，你会很直观的发现这一点。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3e1ae1060120400bbced230a3baec6c9~tplv-k3u1fbpfcp-zoom-1.image) **解决方案** 使用 `background-clip` 属性调整上面的默认效果，这个属性的默认值为 border-box，此时背景会被元素的 border 给遮盖，它还可以配置 padding-box || content-box, 此时浏览器将以内边距或内容区外沿来渲染。修改后，border 的半透明效果就生效了。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/34355a88a57546689b65e1247018cdae~tplv-k3u1fbpfcp-zoom-1.image) **拓展** background-clip 还有个 `text` 属性，很有意思，当设置为text 后，背景会被裁剪成文字的`前景色`。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/7de30458a44840808a682f1e4510a660~tplv-k3u1fbpfcp-zoom-1.image) ## 2-多重边框介绍：使用 border 来生成单一的边框很容易，但是若想生成多重边框就做不到了，通常需要使用各种 hack 例如使用多个元素来模拟实现。 ### box-shadow 方案一个正值的扩张半径加上两个为零的偏移量以及为零的模糊值，得到的“投影”其实就是一条实线；再结合 box-shadow 的逗号分隔语法，来创建任意数量的投影。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/da6e1dbd075947359539a04e44f39970~tplv-k3u1fbpfcp-zoom-1.image) 注意： 1. 投影行为跟边框不完全一致 1. 生成的边框默认出现在元素外圈，可以加上 `inset` 关键字来使投影绘制在元素的内圈，注意预留足够的内边距来腾出足够的间隙 ### outline 方案如果只需要两层边框，可以在常规边框的基础上，增加 `outline(描边)` 属性来产生外层的边框，特点是比较灵活。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/5359db0865b34e51ac370942cfcda640~tplv-k3u1fbpfcp-zoom-1.image) **总结**: 这两种方案都可以实现多重边框的效果，但是outline 只适用于双层边框的场景，如果需要更多层边框，可以用 box-shadow 来实现，另外这两种方案都有一个潜在的缺陷，采用时一定要在不同的浏览器中测试好最终效果。 ## 3-灵活的背景定位介绍：想要的效果：使背景图片针对某个角进行准确的偏移定位？ ### background-position 方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8a34729048e24c08844662bb1646f62b~tplv-k3u1fbpfcp-zoom-1.image) ### background-origin 方案这种方案的优点是，当内边距改变时，其会自动进行位置偏移更新，不用重新声明新的偏移量。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/69eec67d96024365b7fdf8f2930aff59~tplv-k3u1fbpfcp-zoom-1.image) ### calc() 方案 calc() 也可以结合 background-position 进行准确的计算偏移量，达到同样的效果。注意 calc() 函数内部的 - 和 + 运算符两侧需要各加一个空白符，否则会解析错误。 ```javascript background-position: calc(100% - 20px) calc(100% - 10px); ``` ## 4-边框内圆角介绍：想要的效果如下，只显示内部圆角，外部仍然为矩角 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/37c6428507d04316baa38b308a5b2b6b~tplv-k3u1fbpfcp-zoom-1.image) ### 双元素叠加方案使用双 div 元素叠加来实现 ```javascript

.parent { margin: 100px auto; width: 400px; height: 200px; background: #655; padding: 0.8em; } .child { height: 170px; background: tan; padding: 1em; border-radius: 0.8em; } ``` ### 单元素方案这种方案在书中提到是个 hack, 果然我写这篇文章的时候，验证了谷歌浏览器中 `outline` 的样式会跟着`border-radius` 走，所以这个方案基本已经失效了。 ```javascript div { outline: .6em solid #655; box-shadow: 0 0 0 .4em #655; /* todo calculate max of this */ max-width: 10em; border-radius: .8em; padding: 1em; margin: 1em; background: tan; font: 100%/1.5 sans-serif; } ``` ## 5-条纹背景 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/41fdf7c9e0d748fb872da58df71e2655~tplv-k3u1fbpfcp-zoom-1.image) ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8d49b2b43c9640a4be32f1ad6648ff80~tplv-k3u1fbpfcp-zoom-1.image) ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/7248c7efc40f4020831eb2bc20215b27~tplv-k3u1fbpfcp-zoom-1.image) ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/066133da835a4756a9ff1d9f1a54bd08~tplv-k3u1fbpfcp-zoom-1.image) 介绍: 传统方案都是用 `svg` 或者图片来解决，这里直接使用 css 来创建条纹图案 ```javascript // 水平条纹效果 background: linear-gradient(#fb3 50%, #58a 50%); background-size: 100% 30px; // 垂直条纹效果 background: linear-gradient(to right, #fb3 50%, #58a 0); background-size: 30px 100%; // 斜向条纹 background: linear-gradient(45deg, #fb3 50%, #58a 0); background-size: 30px 30px; // 同色系条纹 background: repeating-linear-gradient(30deg, #79b, #79b 15px, #58a 0, #58a 30px); background: #58a; // 同色系条纹重构 background: repeating-linear-gradient( 30deg, hsla(0, 0%, 100%, .1), hsla(0, 0%, 100%, .1) 15px, transparent 0, transparent 30px); background: #58a; ``` ## 6-复杂的背景图案 ### 桌布图案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/9bd52da9e96145f3bc8a9c865326c7d6~tplv-k3u1fbpfcp-zoom-1.image)![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b972ac0d72f3472eb0c5aa8a379f68ab~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Checkerboard */ background: #eee; background-image: linear-gradient(45deg, rgba(0,0,0,.25) 25%, transparent 0, transparent 75%, rgba(0,0,0,.25) 0), linear-gradient(45deg, rgba(0,0,0,.25) 25%, transparent 0, transparent 75%, rgba(0,0,0,.25) 0); background-position: 0 0, 15px 15px; background-size: 30px 30px; min-height: 100%; /** * Polka dot */ background: #655; background-image: radial-gradient(tan 20%, transparent 0), radial-gradient(tan 20%, transparent 0); background-size: 30px 30px; background-position: 0 0, 15px 15px; ``` ### 棋盘 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/ed6a6137a88f4ec98b7677704355da16~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Checkerboard */ background: #eee; background-image: linear-gradient(45deg, rgba(0,0,0,.25) 25%, transparent 0, transparent 75%, rgba(0,0,0,.25) 0), linear-gradient(45deg, rgba(0,0,0,.25) 25%, transparent 0, transparent 75%, rgba(0,0,0,.25) 0); background-position: 0 0, 15px 15px; background-size: 30px 30px; min-height: 100%; /** * Checkerboard with SVG */ background: #eee url('data:image/svg+xml,\ '); background-size: 30px 30px; ``` ### 角向渐变 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8e71d49c54214fe59683555f998f6de0~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Conic gradients test * PASS if green gradient, FAIL if red. */ background: red; background: conic-gradient(limegreen, green, limegreen); min-height: 100%; ``` ## 7-伪随机背景介绍：重复的平铺图案虽然美观，但是不太自然，下面介绍增加随机性背景的方法。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b3cb783039a544329d5e2e35334ef04f~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Pseudorandom stripes */ background: hsl(20, 40%, 90%); background-image: linear-gradient(90deg, #fb3 11px, transparent 0), linear-gradient(90deg, #ab4 23px, transparent 0), linear-gradient(90deg, #655 23px, transparent 0); background-size: 83px 100%, 61px 100%, 41px 100%; ``` ## 8-连续的图像边框介绍：通常这种效果是借助 `双 dom` 来实现，一个作为背景图，一个作为内容；我们的改进方案是基于一个元素来实现的。 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a5ace83467d54ee4afcf7537bbf0bb37~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Basic border-image demo */ div { border: 40px solid transparent; border-image: 33.334% url('data:image/svg+xml,

Click me

.button { transform: skewX(45deg); } .button > div { transform: skewX(-45deg); } .button { display: inline-block; padding: .5em 1em; border: 0; margin: .5em; background: #58a; color: white; text-transform: uppercase; text-decoration: none; font: bold 200%/1 sans-serif; } ``` ### 伪元素方案 ```javascript /** * Parallelograms — with pseudoelements */

Click me

.button { position: relative; display: inline-block; padding: .5em 1em; border: 0; margin: .5em; background: transparent; color: white; text-transform: uppercase; text-decoration: none; font: bold 200%/1 sans-serif; } .button::before { content: ''; /* To generate the box */ position: absolute; top: 0; right: 0; bottom: 0; left: 0; z-index: -1; background: #58a; transform: skew(45deg); } ``` ## 11-菱形图片介绍两种使用 css 制作菱形图片的方案，相对于设计师提供裁切好的图片，更加灵活 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2b8e605c0f2f430ea42f926ffef64f79~tplv-k3u1fbpfcp-zoom-1.image) ### 基于变形的方案 ```javascript /** * Diamond images — via transforms */

.diamond { width: 250px; height: 250px; transform: rotate(45deg); overflow: hidden; margin: 100px; } .diamond img { max-width: 100%; transform: rotate(-45deg) scale(1.42); z-index: -1; position: relative; } ``` ### 裁切路径方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/21142963b4f94eb89e5cf6486a6df2d2~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Diamond images — via clip-path */ img { max-width: 250px; margin: 20px; -webkit-clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%); clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%); transition: 1s; } img:hover { -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); } ``` ## 12-切角效果背景知识：css 渐变，`background-size`, '条纹背景' `切角`是一种流行的设计风格，使用css 制作切角可以实现更加灵活和多样的颜色效果 ### 渐变方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/587c3127eb08432c9f71ecbeb004abac~tplv-k3u1fbpfcp-zoom-1.image) ```javascript

Hey, focus! You’re er!

/** * Beveled corners — with gradients */ div { background: #58a; background: linear-gradient(135deg, transparent 15px, #58a 0) top left, linear-gradient(-135deg, transparent 15px, #58a 0) top right, linear-gradient(-45deg, transparent 15px, #58a 0) bottom right, linear-gradient(45deg, transparent 15px, #58a 0) bottom left; background-size: 50% 50%; background-repeat: no-repeat; padding: 1em 1.2em; max-width: 12em; color: white; font: 150%/1.6 Baskerville, Palatino, serif; } ``` ### 弧形切角渐变技巧的一个变种 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/e99126bfb8284abd85e932ded68c0aa1~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Scoop corners */ div { background: #58a; background: radial-gradient(circle at top left, transparent 15px, #58a 0) top left, radial-gradient(circle at top right, transparent 15px, #58a 0) top right, radial-gradient(circle at bottom right, transparent 15px, #58a 0) bottom right, radial-gradient(circle at bottom left, transparent 15px, #58a 0) bottom left; background-size: 50% 50%; background-repeat: no-repeat; padding: 1em 1.2em; max-width: 12em; color: white; font: 130%/1.6 Baskerville, Palatino, serif; } ``` ### 内联 SVG 与 border-image 方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/afa4a075b49b47689798903cc6a6220b~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Beveled corners — with border-image and an inline SVG */ div { border: 21px solid transparent; border-image: 1 url('data:image/svg+xml,\ '); background: #58a; background-clip: padding-box; padding: .2em .3em; max-width: 12em; color: white; font: 150%/1.6 Baskerville, Palatino, serif; } ``` ### 裁切路径方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b3eb8e92f4ee47f58757a74e028ca191~tplv-k3u1fbpfcp-zoom-1.image) 强烈推荐这种，可以比较方便的制作大量不同颜色的切角图片，只需要改变背景色就好。 ```javascript /** * Beveled corners — with clip-path */ div { background: #58a; -webkit-clip-path: polygon(20px 0, calc(100% - 20px) 0, 100% 20px, 100% calc(100% - 20px), calc(100% - 20px) 100%, 20px 100%, 0 calc(100% - 20px), 0 20px); clip-path: polygon(20px 0, calc(100% - 20px) 0, 100% 20px, 100% calc(100% - 20px), calc(100% - 20px) 100%, 20px 100%, 0 calc(100% - 20px), 0 20px); padding: 1em 1.2em; max-width: 12em; color: white; font: 150%/1.6 Baskerville, Palatino, serif; } ``` ## 13-梯形标签页背景知识：基本的`3D变形`，“平行四边形” 方案1: 伪元素制作两条斜边，border 制作上下平行边方案2: 3D 旋转，普通的3D 旋转会有副作用比如文字的变形 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c279db3340e14105862366f9f2ce58a3~tplv-k3u1fbpfcp-zoom-1.image) ```javascript

Content area

/** * Trapezoid tabs */ body { padding: 40px; font: 130%/2 Frutiger LT Std, sans-serif; } nav { position: relative; z-index: 1; padding-left: 1em; } nav > a { position: relative; display: inline-block; padding: .3em 1em 0; color: inherit; text-decoration: none; margin: 0 -.3em; } nav > a::before, main { border: .1em solid rgba(0,0,0,.4); } nav a::before { content: ''; /* To generate the box */ position: absolute; top: 0; right: 0; bottom: 0; left: 0; z-index: -1; border-bottom: none; border-radius: .5em .5em 0 0; background: #ccc linear-gradient(hsla(0,0%,100%,.6), hsla(0,0%,100%,0)); box-shadow: 0 .15em white inset; transform: scale(1.1, 1.3) perspective(.5em) rotateX(5deg); transform-origin: bottom; } nav a.selected { z-index: 2;} nav a.selected::before { background-color: #eee; margin-bottom: -.08em; } main { display: block; margin-bottom: 1em; background: #eee; padding: 1em; border-radius: .15em; } nav.left > a::before { transform: scale(1.2, 1.3) perspective(.5em) rotateX(5deg); transform-origin: bottom left; } nav.right { padding-left: 2em; } nav.right > a::before { transform: scale(1.2, 1.3) perspective(.5em) rotateX(5deg); transform-origin: bottom right; } ``` 14-简单的饼图 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/08d75667ef08403e9043511e74d78589~tplv-k3u1fbpfcp-zoom-1.image) ### 基于transtorm 和 animation ```javascript /** * Animated pie chart */ .pie { width: 100px; height: 100px; border-radius: 50%; background: yellowgreen; background-image: linear-gradient(to right, transparent 50%, currentColor 0); color: #655; } .pie::before { content: ''; display: block; margin-left: 50%; height: 100%; border-radius: 0 100% 100% 0 / 50%; background-color: inherit; transform-origin: left; animation: spin 3s linear infinite, bg 6s step-end infinite; } @keyframes spin { to { transform: rotate(.5turn); } } @keyframes bg { 50% { background: currentColor; } } ``` ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c0b58bd19307405683290026e7980926~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Static pie charts */ .pie { display: inline-block; position: relative; width: 100px; line-height: 100px; border-radius: 50%; background: yellowgreen; background-image: linear-gradient(to right, transparent 50%, #655 0); color: transparent; text-align: center; } @keyframes spin { to { transform: rotate(.5turn); } } @keyframes bg { 50% { background: #655; } } .pie::before { content: ''; position: absolute; top: 0; left: 50%; width: 50%; height: 100%; border-radius: 0 100% 100% 0 / 50%; background-color: inherit; transform-origin: left; animation: spin 50s linear infinite, bg 100s step-end infinite; animation-play-state: paused; animation-delay: inherit; } ``` ### SVG 方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a40c35690af84770a3d112dc84542992~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Pie charts — with SVG */ .pie { width: 100px; height: 100px; display: inline-block; margin: 10px; transform: rotate(-90deg); } svg { background: yellowgreen; border-radius: 50%; } circle { fill: yellowgreen; stroke: #655; stroke-width: 32; } @keyframes grow { to { stroke-dasharray: 100 100 } } .pie.animated circle { animation: grow 2s infinite linear; } ``` ## 15-单侧投影 ### 单侧投影 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/21ec3960d0b04b308b5ad02b681cc829~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * One-sided shadow */ div { width: 1.6in; height: 1in; background: #fb3; box-shadow: 0 5px 4px -4px black; } ``` ### 邻边投影 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/07f5f41431a74ed7a863d76cd2b6e3a0~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * One-sided shadow */ div { width: 1.6in; height: 1in; background: #fb3; box-shadow: 3px 3px 6px -3px black; } ``` ### 双侧投影 ### ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/428e10d4e2bd4641bf334462df140979~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * One-sided shadow */ div { width: 1.6in; height: 1in; background: #fb3; box-shadow: 5px 0 5px -5px black, -5px 0 5px -5px black; } ``` ## 16-不规则投影 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/71aab4049d7a4e2eab0ed02c22c4b00c~tplv-k3u1fbpfcp-zoom-1.image) ```javascript

Speech bubble

Dotted border

Cutout corners

/** * Irregular drop-shadows */ div { position: relative; display: inline-flex; flex-direction: column; justify-content: center; vertical-align: bottom; box-sizing: border-box; width: 5.9em; height: 5.2em; margin: .6em; background: #fb3; /*box-shadow: .1em .1em .3em rgba(0,0,0,.5);*/ -webkit-filter: drop-shadow(.1em .1em .1em rgba(0,0,0,.5)); filter: drop-shadow(.1em .1em .1em rgba(0,0,0,.5)); font: 200%/1.6 Baskerville, Palatino, serif; text-align: center; } .speech { border-radius: .3em; } .speech::before { content: ''; position: absolute; top: 1em; right: -.7em; width: 0; height: 0; border: 1em solid transparent; border-left-color: #fb3; border-right-width: 0; } .dotted { background: transparent; border: .3em dotted #fb3; } .cutout { border: .5em solid #58a; border-image: 1 url('data:image/svg+xml,\ '); background-clip: padding-box; } ``` ## 17-染色效果 ### 基于滤镜的方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/6889e548e71a46d481d46cb874506bfc~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Color tinting — with filters */ img { max-width: 640px; transition: 1s filter, 1s -webkit-filter; -webkit-filter: sepia() saturate(4) hue-rotate(295deg); filter: sepia() saturate(4) hue-rotate(295deg); } img:hover, img:focus { -webkit-filter: none; filter: none; } ``` ### 基于混合模式的方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/78509daff2484db9b604c23562f99c3d~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Color tinting — with blending modes */ .tinted-image { width: 300px; height: 440px; background-size: cover; background-color: hsl(335, 100%, 50%); background-blend-mode: luminosity; transition: .5s background-color; } .tinted-image:hover { background-color: transparent; } ``` ## 18-毛玻璃效果背景知识：`PGBA/HSLA 颜色` , `filter: blur()` ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8f119772e9fd49318d293f6a6facab1f~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Frosted glass effect */ body { min-height: 100vh; box-sizing: border-box; margin: 0; padding-top: calc(50vh - 6em); font: 150%/1.6 Baskerville, Palatino, serif; } body, main::before { background: url("http://placekitten.com/200/300") 0 / cover fixed; } main { position: relative; margin: 0 auto; padding: 1em; max-width: 23em; background: hsla(0,0%,100%,.25) border-box; overflow: hidden; border-radius: .3em; box-shadow: 0 0 0 1px hsla(0,0%,100%,.3) inset, 0 .5em 1em rgba(0, 0, 0, 0.6); text-shadow: 0 1px 1px hsla(0,0%,100%,.3); } main::before { content: ''; position: absolute; top: 0; right: 0; bottom: 0; left: 0; margin: -30px; z-index: -1; -webkit-filter: blur(20px); filter: blur(20px); } blockquote { font-style: italic } blockquote cite { font-style: normal; } ``` ## 19-折角效果背景知识： css 变形， css 渐变， “切角效果” ### 45度折角的解决方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f7b48b68838f4006a678e21508786592~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Folded corner effect */ div { width: 12em; background: #58a; /* Fallback */ background: linear-gradient(to left bottom, transparent 50%, rgba(0,0,0,.4) 0) 100% 0 no-repeat, linear-gradient(-135deg, transparent 1.5em, #58a 0); background-size: 2em 2em, auto; padding: 2em; color: white; font: 100%/1.6 Baskerville, Palatino, serif; } ``` ### 其他角度的解决方案 ![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a298727d29ee453c8298bc06b666711b~tplv-k3u1fbpfcp-zoom-1.image) ```javascript /** * Folded corner effect — at an angle */ div { position: relative; width: 12em; background: #58a; /* Fallback */ background: linear-gradient(-150deg, transparent 1.5em, #58a 0); padding: 2em; color: white; font: 100%/1.6 Baskerville, Palatino, serif; border-radius: .5em; } div::before { content: ''; position: absolute; top: 0; right: 0; width: 1.73em; height: 3em; background: linear-gradient(to left bottom, transparent 50%, rgba(0,0,0,.2) 0, rgba(0,0,0,.4)) 100% 0 no-repeat; transform: translateY(-1.3em) rotate(-30deg); transform-origin: bottom right; border-bottom-left-radius: .5em; box-shadow: -.2em .2em .3em -.1em rgba(0,0,0,.15) } ``` ## 总结本文整理了《css揭秘中》19个有趣的css 技巧案例，下篇将继续整理剩下的 28 个。 `更新`：下篇：[《css揭秘》- 47个不可不知的 css 技巧(下篇20-47🔥， 7K长文多图预警)](https://juejin.cn/post/7139680024953061384) 文章合集： [Github 合集](https://link.juejin.cn/?target=https%3A%2F%2Fgithub.com%2Fmingjiezhou%2Fnotes%2Fissues "https://link.juejin.cn/?target=https%3A%2F%2Fgithub.com%2Fmingjiezhou%2Fnotes%2Fissues")、 [掘金首发合集](https://juejin.cn/user/1151943916391965/posts "https://juejin.cn/user/1151943916391965/posts")