前端项目开发重置样式，包括清空浏览器的默认样式、设置网页主体的背景颜色、外间距、内间距、行高、字体大小、字体家族、页面布局、背景颜色样式、颜色、设置超链接的样式、字体大小、文本处理与对齐方式、行高、鼠标样式、告诉部分浏览器不要给图片添加边框、将超出宽度的文字截字并用省略号表示、浮动公共样式、清除浮动公共样式、显示方式与定位、定位的绝对居中、弹性盒的绝对居中、外间距和内间距公共样式，之后可能还会进行修改和补充。
CSS代码如下：
/*!
* reset - v1.1.0 - 9/21/2020 By Serena
*/
/* 清空浏览器的默认样式 */
div,p,ul,ol,li,dd,h1,h2,h3,h4,h5,h6,dt,dl,form,input,textarea,blockquote,th,td {padding: 0; margin: 0}
h1,h2,h3,h4,h5,h6 {font-size: 16px; font-weight: 400}
em,i {font-style: normal }
ul,ol {list-style: none }
label {cursor : pointer}
/* 设置网页主体的背景颜色、外间距、内间距、行高、字体大小、字体家族 */
body {background: #fff; margin: 0; padding: 0; line-height: 1; font-size: 14px; font-family: "Microsoft YaHei","微软雅黑",Tahoma,Arial}
/* 页面布局 */
.wt1000 {width: 1000px; margin: 0 auto}
.w220 {width: 220px}
.layout {width: 100%}
/* 背景颜色样式 */
.bgblack {background-color: #000}
.bgwhite {background-color: #fff}
.bgred {background-color: #f00}
.bgorange {background-color: #f90}
.bgyellow {background-color: #ff0}
.bggreen {background-color: #393}
.bgblue {background-color: #00f}
.bgpurple {background-color: #808}
.bggray {background-color: #999}
/* 颜色 */
.black ,a.black {color: #000}
.white ,a.white {color: #fff}
.red ,a.red {color: #f00}
.orange ,a.orange {color: #f90}
.yellow ,a.yellow {color: #ff0}
.green ,a.green {color: #393}
.blue ,a.blue {color: #09f}
.purple ,a.purple {color: #808}
.gray ,a.gray {color: #999}
/* 设置超链接的样式 */
a {color: #666 ; text-decoration: none}
a:hover {color: #ccc ; text-decoration: none}
/* 字体大小 */
.font12 {font-size: 12px}
.font14 {font-size: 14px}
.font16 {font-size: 16px}
.font18 {font-size: 18px}
.font20 {font-size: 22px}
.font22 {font-size: 22px}
.font24 {font-size: 24px}
.font26 {font-size: 26px}
.font28 {font-size: 28px}
.font30 {font-size: 30px}
.font32 {font-size: 32px}
.font34 {font-size: 34px}
.font36 {font-size: 36px}
.font38 {font-size: 38px}
.font40 {font-size: 40px}
/* 文本处理与对齐方式 */
.txj {text-align: justify; color: gray}
.tc {text-align: center}
.tl {text-align: left}
.tr {text-align: right}
.vam {vertical-align: middle}
.fb {font-weight: bold}
/* 行高 */
.lh16 {line-height: 16px}
.lh18 {line-height: 18px}
.lh20 {line-height: 20px}
.lh22 {line-height: 22px}
.lh24 {line-height: 24px}
.lh26 {line-height: 26px}
.lh28 {line-height: 28px}
.lh30 {line-height: 30px}
.lh32 {line-height: 32px}
.lh34 {line-height: 34px}
.lh36 {line-height: 36px}
.lh38 {line-height: 38px}
.lh40 {line-height: 40px}
/* 鼠标样式 */
.pointer {cursor: pointer}
/* 告诉部分浏览器不要给图片添加边框 */
img {border: none}
table,th,td {border-collapse: collapse; border-spacing: 0}
/* 将超出宽度的文字截字并用省略号表示 */
.cutFont {white-space: nowrap; text-overflow: ellipsis; overflow: hidden}
/* 浮动公共样式 */
.fl {float: left}
.fr {float: right}
.cl {clear: both}
/* 清除浮动公共样式 */
.clearfix:after {content: "\20"; display: block; height: 0; clear: both; visibility: hidden}
.clearfix {*zoom: 1}
/* 显示方式与定位 */
.pore {position: relative}
.inline {display : inline-block}
.block {display : block}
.none {display : none}
/* 定位的绝对居中 */
.mid {position: absolute; margin: auto;top: 0;bottom: 0;left: 0; right: 0;}
.midx {position: absolute; margin: auto;left: 0; right: 0;}
.midy {position: absolute; margin: auto;top: 0;bottom: 0;}
/* 弹性盒的绝对居中 */
.center {display: flex; justify-content: center; align-items: center}
.centerx {display: flex; justify-content: center}
.centery {display: flex; align-items: center}
/* 外间距和内间距公共样式 */
.mt5 {margin-top: 5px }
.mt10 {margin-top: 10px}
.mt15 {margin-top: 15px}
.mt20 {margin-top: 20px}
.mt25 {margin-top: 25px}
.mt30 {margin-top: 30px}
.mt35 {margin-top: 35px}
.mt40 {margin-top: 40px}
.mt45 {margin-top: 45px}
.mt50 {margin-top: 50px}
.mb5 {margin-bottom: 5px }
.mb10 {margin-bottom: 10px}
.mb15 {margin-bottom: 15px}
.mb20 {margin-bottom: 20px}
.mb25 {margin-bottom: 25px}
.mb30 {margin-bottom: 30px}
.mb35 {margin-bottom: 35px}
.mb40 {margin-bottom: 40px}
.mb45 {margin-bottom: 45px}
.mb50 {margin-bottom: 50px}
.ml5 {margin-left: 5px }
.ml10 {margin-left: 10px}
.ml15 {margin-left: 15px}
.ml20 {margin-left: 20px}
.ml25 {margin-left: 25px}
.ml30 {margin-left: 30px}
.ml35 {margin-left: 35px}
.ml40 {margin-left: 40px}
.ml45 {margin-left: 45px}
.ml50 {margin-left: 50px}
.mr5 {margin-right: 5px }
.mr10 {margin-right: 10px}
.mr15 {margin-right: 15px}
.mr20 {margin-right: 20px}
.mr25 {margin-right: 25px}
.mr30 {margin-right: 30px}
.mr35 {margin-right: 35px}
.mr40 {margin-right: 40px}
.mr45 {margin-right: 45px}
.mr50 {margin-right: 50px}
.pt5 {padding-top: 5px }
.pt10 {padding-top: 10px}
.pt15 {padding-top: 15px}
.pt20 {padding-top: 20px}
.pt25 {padding-top: 25px}
.pt30 {padding-top: 30px}
.pt35 {padding-top: 35px}
.pt40 {padding-top: 40px}
.pt45 {padding-top: 45px}
.pt50 {padding-top: 50px}
.pb5 {padding-bottom: 5px }
.pb10 {padding-bottom: 10px}
.pb15 {padding-bottom: 15px}
.pb20 {padding-bottom: 20px}
.pb25 {padding-bottom: 25px}
.pb30 {padding-bottom: 30px}
.pb35 {padding-bottom: 35px}
.pb40 {padding-bottom: 40px}
.pb45 {padding-bottom: 45px}
.pb50 {padding-bottom: 50px}
.pl5 {padding-left: 5px }
.pl10 {padding-left: 10px}
.pl15 {padding-left: 15px}
.pl20 {padding-left: 20px}
.pl25 {padding-left: 25px}
.pl30 {padding-left: 30px}
.pl35 {padding-left: 35px}
.pl40 {padding-left: 40px}
.pl45 {padding-left: 45px}
.pl50 {padding-left: 50px}
.pr5 {padding-right: 5px}
.pr10 {padding-right: 10px}
.pr15 {padding-right: 15px}
.pr20 {padding-right: 20px}
.pr25 {padding-right: 25px}
.pr30 {padding-right: 30px}
.pr35 {padding-right: 35px}
.pr40 {padding-right: 40px}
.pr45 {padding-right: 45px}
.pr50 {padding-right: 50px}
