html,
body {
    height: 100%;
}

body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
}

.signin {
    width: 100%;
    max-width: 600px;
    padding: 15px;
    margin: auto;
}

.signin-background {
    background-color: #f5f5f5;
}