body {
    height: 100vh;
    display: flex;
    display: -ms-flexbox;
    -ms-flex-align: center;
    align-items: center;
    background-color: #f5f5f5;
    padding: 0;
    margin: 0;
    background-image: url(/images/bg/387625.jpg);
}
.signin {
    width: 100%;
    max-width: 330px;
    padding: 30px;
    margin-top: -200px;
    background-color: #f5f5f5;
    border-radius: 15px;
}