*{margin:0;padding:0;}
body{
    height:100%;
}
.background_img{
    position: absolute;
    width:100%;
    height:100%;
    overflow: hidden;
}
.loginBox{
    position: absolute;
    left:50%;top:45%;
    width: 500px;
    height: 310px;
    margin-left:-250px;
    margin-top:-140px;
    background-color:white;
    box-shadow: 26px 6px 22px 8px rgba(6, 0, 1, 0.6);
    border: solid 1px rgba(86, 79, 79, 0.49);
    /*opacity: 0.4;*/
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    border-radius: 10px;
}
.username_input:after,
.password_input:after,
.login_btn:after{
    content: '';
    display: block;
    clear: both;
}
.username_input,
.password_input,
.login_btn{
    width: 100%;
}
.username_input{
    margin-left:50px;
    border:solid 2px #ccc;width:500px;height:48px;
    background:url('../images/avatar.png') no-repeat 0 center;
}
.password_input{
    text-align: center;
    margin:30px 0 30px 50px;
    border:solid 2px #ccc;width:500px;height:48px;
    background:url('../images/password.png') no-repeat 0 center;
}
.username_input input,
.password_input input{
    float:left;border:none;background:none;height:48px;
    line-height:48px;width:100%; text-indent:50px;
    font-size:20px;
}
.login_btn input{
    float:left;
    margin-left:150px;
    border:none;
    width:270px;
    height:45px;
    line-height: 45px;
    background-image:
            linear-gradient(90deg, #1695c5 0%, #52b0cf 50%, #1695c5 100%),
            linear-gradient(#2a8fb9, #2a8fb9);
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    border-radius: 10px;
    color:white;
    font-size: 28px;
    font-weight: normal;
    font-stretch: normal;
}
.login_btn a{
    vertical-align: bottom;
    float:right;
    margin-top:25px;
    margin-right:50px;
}
.login_btn a:hover{
    cursor: pointer;
}