*{
    margin0;
    padding0;
    box-sizing:border-box;
}
body{
    height:100vh;
    width:100vw;
    background-color:#e1e1e1;
}
.login-form{
    height:470px;
    width:320px;
    position:fixed;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    background:#fff;
    border-radius:4px;
}