Html 去除css默认样式

@charset "gb2312";
/* ----------------------------------------
reset.css
author:geduo
Description: CSS样式重置代码
Version 1.0, 2012-10-18
----------------------------------------- */
/* 防止用户自定义背景颜色对网页的影响 */
html { color: #333333; background: #fff; }
/* 始终不显示滚动条 */
body { overflow-x: hidden; /*隐藏水平滚动条*/ }
/* 内外边距重置 */
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, textarea, p, blockquote, th, td, hr, button, article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { margin: 0; padding: 0; }
body, button, input, select, textarea { font-family: "Microsoft Yahei", "微软雅黑", Tahoma, Arial, Helvetica, STHeiti; font-size: 12px; word-wrap: break-word; color: #333333; }
input, select, textarea { font-size: 100%; }
div:focus { outline: none; }
/* 去掉各Table  cell 的边距并让其边重合 */
table { border-collapse: collapse; border-spacing: 0; }
/* IE bug fixed: th 不继承 text-align*/
th { text-align: inherit; }
/* 去除默认边框 */
fieldset, img { border: 0; }
/* ie6 7 8(q) bug 显示为行内表现 */
iframe { display: block; }
/* 去掉 firefox 下此元素的边框 */
abbr, acronym { border: 0; font-variant: normal; }
/* 去掉列表前的标识, li 会继承 */
ol, ul, li { list-style: none; }
/* 左对齐排版 */
caption, th { text-align: left; }
/* 让标题都自定义 */
h1, h2, h3, h4, h5, h6 { font-size: 100%; font-weight: 500; }
q:before, q:after { content: ''; }
/* 让链接在 hover 状态下不显示下划线 */
a:hover { text-decoration: none; }
a:visited { color: #333333; }
/* 默认不显示下划线 */
ins, a { text-decoration: none; }
/* button的cursor属性 */
button, a { outline: none; cursor: pointer; }
/*hr统一样式*/
hr { height: 1px; border: none; border-top: 1px solid #CCCCCC; }
/*常用属性*/
.clear{ clear:both}
.left{ float:left}
.right{ float:right}

参考：HTML默认样式重置CSS写法总结_Lioner-CSU的博客-CSDN博客