前端CSS经典三列布局

普通布局

.wrap{
    overflow: hidden;
}
.left,
.middle,
.right {
    float: left;
}

.left,
.right {
    width: 200px;
    height: 200px;
    background-color: aqua;
}

.middle {
    width: calc(100% - (200px * 2));
    height: 300px;
    background-color: antiquewhite;
}

<div class="wrap">
    <div class="left"></div>
    <div class="middle"></div>
    <div class="right"></div>
</div>

圣杯布局

:root {
    --width: 200px;
}

.wrap {
    overflow: hidden;
    padding: 0 200px;
}

.left,
.middle,
.right {
    float: left;
}

.left,
.right {
    position: relative;
    top: 0;
    width: var(--width);
    height: 200px;
    background-color: aqua;
}

.middle {
    width: 100%;
    height: 300px;
    background-color: antiquewhite;
}

.left {
    left: calc(0% - var(--width));
    margin-left: -100%;
}

.right {
    right: calc(0% - var(--width));
    margin-left: calc(0% - var(--width));
}

<div class="wrap">
    <div class="middle"></div>
    <div class="left"></div>
    <div class="right"></div>
</div>

双飞翼布局

:root{
    --width: 200px;
}

.wrap {
    overflow: hidden;
}

.left,
.middle,
.right {
    float: left;
}

.left,
.right {
    width: var(--width);
    height: 200px;
    background-color: aqua;
}

.middle {
    width: 100%;
}
.content{
    margin: 0 var(--width);
    height: 300px;
    background-color: antiquewhite;
}
.left{
    margin-left: -100%;
}
.right{
    margin-left: calc(0% - var(--width));
}

<div class="wrap">
    <div class="middle">
        <div class="content">中</div>
    </div>
    <div class="left">左</div>
    <div class="right">右</div>
</div>

弹性布局

* {
    margin: 0;
    padding: 0;
}

.app {
    display: flex;
}

.left,
.right {
    flex-shrink: 0;
    width: 260px;
}

.left .inner,
.right .inner {
    height: 200px;
    background-color: aqua;
}

.middle {
    flex: 1;
    order: 1;
    min-width: 1100px;
}

.middle .inner {
    height: 300px;
    background-color: bisque;
}

.right {
    order: 2;
}

<div class="app">
    <div class="wrap middle">
        <div class="inner">中</div>
    </div>
    <div class="wrap left">
        <div class="inner">左</div>
    </div>
    <div class="wrap right">
        <div class="inner">右</div>
    </div>
</div>

网格布局

* {
    margin: 0;
    padding: 0;
}

.app {
    overflow: hidden;
    display: grid;
    grid-template-columns: 260px 1fr 260px;
    grid-template-areas: "left middle right";
}

.left .inner,
.right .inner {
    height: 200px;
    background-color: aqua;
}

.middle {
    grid-area: middle;
}

.middle .inner {
    height: 300px;
    background-color: bisque;
}

.left {
    grid-area: left;
}

.right {
    grid-area: right;
}

<div class="app">
    <div class="middle">
        <div class="inner">中</div>
    </div>
    <div class="left">
        <div class="inner">左</div>
    </div>
    <div class="right">
        <div class="inner">右</div>
    </div>
</div>