常用的css文件_css常用的三种选择器

@charset "utf-8";html{background-color:#fff;color:#000;font-size:12px} body,ul,ol,dl,dd,h1,h2,h3,h4,h5,h6,figure,form,fieldset,legend,input,textarea,button,p,blockquote,th,td,pre,xmp{margin:0;padding:0} body,input,textarea,button,select,pre,xmp,tt,code,kbd,samp{line-height:1.5;font-family:tahoma,arial,"Hiragino Sans GB",simsun,sans-serif} h1,h2,h3,h4,h5,h6,small,big,input,textarea,button,select{font-size:100%} h1,h2,h3,h4,h5,h6{font-family:tahoma,arial,"Hiragino Sans GB","微软雅黑",simsun,sans-serif} h1,h2,h3,h4,h5,h6,b,strong{font-weight:normal} address,cite,dfn,em,i,optgroup,var{font-style:normal} table{border-collapse:collapse;border-spacing:0;text-align:left} caption,th{text-align:inherit} ul,ol,menu{list-style:none} fieldset,img{border:0} img,object,input,textarea,button,select{vertical-align:middle} article,aside,footer,header,section,nav,figure,figcaption,hgroup,details,menu{display:block} audio,canvas,video{display:inline-block;*display:inline;*zoom:1} blockquote:before,blockquote:after,q:before,q:after{content:"\0020"} textarea{overflow:auto;resize:vertical} input,textarea,button,select,a{outline:0 none;border: none;} button::-moz-focus-inner,input::-moz-focus-inner{padding:0;border:0} mark{background-color:transparent} a,ins,s,u,del{text-decoration:none} sup,sub{vertical-align:baseline} html {overflow-x: hidden;height: 100%;font-size: 50px;-webkit-tap-highlight-color: transparent;} body {font-family: Arial, "Microsoft Yahei", "Helvetica Neue", Helvetica, sans-serif;color: #333;font-size: .28em;line-height: 1;-webkit-text-size-adjust: none;} hr {height: .02rem;margin: .1rem 0;border: medium none;border-top: .02rem solid #cacaca;} a {color: #25a4bb;text-decoration: none;}

@charset "utf-8"; .border, .border-top, .border-right, .border-bottom, .border-left, .border-topbottom, .border-rightleft, .border-topleft, .border-rightbottom, .border-topright, .border-bottomleft { position: relative; } .border::before, .border-top::before, .border-right::before, .border-bottom::before, .border-left::before, .border-topbottom::before, .border-topbottom::after, .border-rightleft::before, .border-rightleft::after, .border-topleft::before, .border-topleft::after, .border-rightbottom::before, .border-rightbottom::after, .border-topright::before, .border-topright::after, .border-bottomleft::before, .border-bottomleft::after { content: "\0020"; overflow: hidden; position: absolute; } /* border * 因，边框是由伪元素区域遮盖在父级 * 故，子级若有交互，需要对子级设置 * 定位 及 z轴 */ .border::before { box-sizing: border-box; top: 0; left: 0; height: 100%; width: 100%; border: 1px solid #eaeaea; transform-origin: 0 0; } .border-top::before, .border-bottom::before, .border-topbottom::before, .border-topbottom::after, .border-topleft::before, .border-rightbottom::after, .border-topright::before, .border-bottomleft::before { left: 0; width: 100%; height: 1px; } .border-right::before, .border-left::before, .border-rightleft::before, .border-rightleft::after, .border-topleft::after, .border-rightbottom::before, .border-topright::after, .border-bottomleft::after { top: 0; width: 1px; height: 100%; } .border-top::before, .border-topbottom::before, .border-topleft::before, .border-topright::before { border-top: 1px solid #eaeaea; transform-origin: 0 0; } .border-right::before, .border-rightbottom::before, .border-rightleft::before, .border-topright::after { border-right: 1px solid #eaeaea; transform-origin: 100% 0; } .border-bottom::before, .border-topbottom::after, .border-rightbottom::after, .border-bottomleft::before { border-bottom: 1px solid #eaeaea; transform-origin: 0 100%; } .border-left::before, .border-topleft::after, .border-rightleft::after, .border-bottomleft::after { border-left: 1px solid #eaeaea; transform-origin: 0 0; } .border-top::before, .border-topbottom::before, .border-topleft::before, .border-topright::before { top: 0; } .border-right::before, .border-rightleft::after, .border-rightbottom::before, .border-topright::after { right: 0; } .border-bottom::before, .border-topbottom::after, .border-rightbottom::after, .border-bottomleft::after { bottom: 0; } .border-left::before, .border-rightleft::before, .border-topleft::after, .border-bottomleft::before { left: 0; } @media (max--moz-device-pixel-ratio: 1.49), (-webkit-max-device-pixel-ratio: 1.49), (max-device-pixel-ratio: 1.49), (max-resolution: 143dpi), (max-resolution: 1.49dppx) { /* 默认值，无需重置 */ } @media (min--moz-device-pixel-ratio: 1.5) and (max--moz-device-pixel-ratio: 2.49), (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 2.49), (min-device-pixel-ratio: 1.5) and (max-device-pixel-ratio: 2.49), (min-resolution: 144dpi) and (max-resolution: 239dpi), (min-resolution: 1.5dppx) and (max-resolution: 2.49dppx) { .border::before { width: 200%; height: 200%; transform: scale(.5); } .border-top::before, .border-bottom::before, .border-topbottom::before, .border-topbottom::after, .border-topleft::before, .border-rightbottom::after, .border-topright::before, .border-bottomleft::before { transform: scaleY(.5); } .border-right::before, .border-left::before, .border-rightleft::before, .border-rightleft::after, .border-topleft::after, .border-rightbottom::before, .border-topright::after, .border-bottomleft::after { transform: scaleX(.5); } } @media (min--moz-device-pixel-ratio: 2.5), (-webkit-min-device-pixel-ratio: 2.5), (min-device-pixel-ratio: 2.5), (min-resolution: 240dpi), (min-resolution: 2.5dppx) { .border::before { width: 300%; height: 300%; transform: scale(.33333); } .border-top::before, .border-bottom::before, .border-topbottom::before, .border-topbottom::after, .border-topleft::before, .border-rightbottom::after, .border-topright::before, .border-bottomleft::before { transform: scaleY(.33333); } .border-right::before, .border-left::before, .border-rightleft::before, .border-rightleft::after, .border-topleft::after, .border-rightbottom::before, .border-topright::after, .border-bottomleft::after { transform: scaleX(.33333); } }