/*所有样式清除*/
body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div,dl,dt,dd,input{
margin: 0;
padding: 0;
}
html{height: 100%;}
body{font-size:12px; height: 100%;}
img,button{border:none;}
li{list-style:none;}
button,input,select,textarea{outline:none;}
a{text-decoration:none; color: #000;}
button{box-sizing: border-box;cursor: pointer;}
.l-float{float: left;}
.r-float{float: right;}
 input::-webkit-input-placeholder{
            color:#bbbbbb;
        }
        input::-moz-placeholder{   /* Mozilla Firefox 19+ */
            color:#bbbbbb;
        }
        input:-moz-placeholder{    /* Mozilla Firefox 4 to 18 */
            color:#bbbbbb;
        }
        input:-ms-input-placeholder{  /* Internet Explorer 10-11 */ 
            color:#bbbbbb;
        }