html {
        color: #333;    /*规定主色调,依据业务场景(非必须)*/    background: #F6F6F6;    /*规定主背景,依据业务场景(非必须)*/    overflow-y: auto;    /*如果有溢出自动形成滚动条*/    -webkit-text-size-adjust: 100%;    /*不想让iPhone横坚屏切换的时候调节文字*/    -ms-text-size-adjust: 100%;}html * { /*所有元素*/    outline: none;    -webkit-tap-highlight-color: rgba(0, 0, 0, 0); /*去除移动端开发点击事件灰色背景如a标签*/}body,html{
        height: 100%;}article,aside,blockquote,body,button,code,dd,details,div,dl,dt,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,hr,input,legend,li,menu,nav,ol,p,pre,section,td,textarea,th,ul {
        margin: 0;    padding: 0;}input,select,textarea {
        font-size: 100%;}table {
        border-collapse: collapse;    border-spacing: 0;}fieldset,img {
        border: none;}address,caption,cite,code,dfn,em,th,var {
        font-style: normal;    font-weight: 500;}ol,ul {
        list-style: none;}h1,h2,h3,h4,h5,h6 {
        font-size: 100%;    font-weight: 500;}q:after,q:before {  /*在标签之间的文字两头加上引号*/    content: '';}a{
        text-decoration: none;}/*input*/button {
        border: none;}button,html input[type='button'],input[type='reset'],input[type='submit'] {
        -webkit-appearance: button;  /*渲染成button的风格*/    text-transform: none;    outline: none;}input::-webkit-input-placeholder,textarea::-webkit-input-placeholder {
        color: #999;  /*输入框提示语的字体样式*/}input::-webkit-inner-spin-button {
    /*解决input的type="number"在部分手机端会出现一个小按钮*/    -webkit-appearance: none;/*去除系统默认appearance的样式,常用于IOS下移除原生样式*/}input::-webkit-outer-spin-button {
    /*解决input的type="number"在部分手机端会出现一个小按钮*/    -webkit-appearance: none;}textarea {
        vertical-align: top;}button,input {
        line-height: normal;}select {
        margin: 0;    outline: 0;}input.fixAKeyboard:focus,textarea.fixAndroidKeyboard:focus {
        -webkit-tap-highlight-color: rgba(255, 255, 255, 0);    -webkit-user-modify: read-write-plaintext-only;}input:-webkit-autofill {
        -webkit-box-shadow: 0 0 0 1000px white inset !important;}button,input[type=button],input[type=checkbox],input[type=reset],input[type=submit],label {
        cursor: pointer;    user-select: none;    -ms-user-select: none;    -moz-user-select: none;    -webkit-user-select: none;}input[type=submit] {
        -webkit-user-modify: read-plaintext-only;    -moz-user-modify: read-plaintext-only;    -ms-user-modify: read-plaintext-only;    -o-user-modify: read-plaintext-only;    user-modify: read-plaintext-only;}input[type='search']::-webkit-search-cancel-button,input[type='search']::-webkit-search-decoration {
        -webkit-appearance: none;}input[type='search'] {
        -webkit-box-sizing: content-box;    -moz-box-sizing: content-box;    box-sizing: content-box;    -webkit-appearance: textfield;}/*flex box*/.flex {
        display: box;    /* OLD - Android 4.4- */    display: -webkit-box;    /* OLD - iOS 6-, Safari 3.1-6 */    display: -moz-box;    /* OLD - Firefox 19- (buggy but mostly works) */    display: -ms-flexbox;    /* TWEENER - IE 10 */    display: -webkit-flex;    /* NEW - Chrome */    display: flex;    -webkit-box-lines: multiple;    -webkit-flex-wrap: wrap;    -moz-flex-wrap: wrap;    -ms-flex-wrap: wrap;    -o-flex-wrap: wrap;    flex-wrap: wrap;}.justify-between {
        -webkit-box-pack: justify;    -webkit-justify-content: space-between;    -ms-flex-pack: justify;    justify-content: space-between;}.justify-center {
        -webkit-box-pack: center;    -webkit-justify-content: center;    -ms-flex-pack: center;    justify-content: center;}.vertical {
        -webkit-box-orient: vertical;    -webkit-box-direction: normal;    -webkit-flex-direction: column;    -ms-flex-direction: column;    flex-direction: column;}*,*:before,*:after {
        box-sizing: border-box; /*所有元素以border开始计算盒子大小*/}.clearfix:after,.clearfix:before {   /*清除浮动*/    content: " ";    display: table;}.clearfix:after {
        clear: both;}.fl {
        float: left;}.fr {
        float: right;}

百分比布局，也叫做流式布局；

清除移动端默认的点击高亮效果：-webkit-tap-highlight-color:transparent;

base.css:

*,::before,::after{

padding:0;

margin:0;

-webkit-box-sizing:border-box; //主流浏览器做兼容；

box-sizing:border-box;

}

input{

border:none;

outline:none;

-webkit-appearance;//清除移动端默认的表单样式；如内阴影效果；

}

布局时候搜索框包一个form可以实现小键盘的箭头变为搜索二字；