body{
    overflow: hidden;
    width: 100%;
    height: 100%;
    background:url("../images/1.jpg") no-repeat 0 0/100% 100% fixed;

}
@keyframes myfirst
{
    0%   {background:url("../images/1.jpg");}
    34%  {background:url("../images/1.jpg");}
    67%  {background:url("../images/1.jpg");}
    100% {background:url("../images/1.jpg");}
}
.form{background: rgba(255,255,255,0.2);width:400px;margin:120px auto;}
/*阴影*/
.fa{display: inline-block;top: 27px;left: 6px;position: relative;color: #ccc;}
input[type="text"],input[type="password"]{padding-left:26px;}
.checkbox{padding-left:21px;}