body {
    background: url('img/winterblue.jpg');
    background-attachment: fixed;
    background-size: cover;
}

.center {
    text-align: center;
}

.container {
    background: #2A76D6;
    width: 50%;
    margin: 0 auto;
    padding: 20px;
    opacity: .7;
    box-shadow: 12px 0 15px -4px rgba(0, 0, 0, 0.2), -12px 0 8px -4px rgba(0, 0, 0, 0.2);
    border-radius: 20px;
    color: #fff;
    text-shadow: 1px 2px 3px #000;
}

.container-spacer {
    padding-top: 15%;
}