body {
    background: url(/images/bgone@3x.png) no-repeat center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    width: 100%;
    height: 100%;
    position: relative;
}

.bg {
    background-image: url(/images/bg_dl@3x.png);
    background-repeat: no-repeat;
    background-position: center;
    width: 986px;
    height: 580px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, 15%);
}
.contain {
    border-radius: 5px;
    border: 1px solid rgba(0, 0, 0, 0.5);
    padding: 30px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.title {
    margin: 10px 48px;
    font-size: 18px;
}

.username, .password {
    margin-top: 20px;
}

.username input, .password input {
    width: 200px;
    height: 30px;
    padding-left: 10px
}

.loginbutton {
    width: 100px;
    transform: translate(50%, 50%);
    height: 30px;

}