.dark-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100%;
    background-color: #121212 !important;
    background-repeat: no-repeat;
    background-size: auto;
    -webkit-background-size: auto;
    -moz-background-size: auto;
    -o-background-size: auto;
}

.dark-nav {
    background-color: #263238 !important;
}

.dark-card {
    background-color: #263238 !important;
}