body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    position: relative;
}

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-size: cover;
    background-position: center;
    opacity: 0;
    animation: fade 20s infinite;
}

.background1 {
    background-image: url('background1.jpg');
    animation-delay: 0s;
}

.background2 {
    background-image: url('background2.jpg');
    animation-delay: 10s;
}

@keyframes fade {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

.container-fluid {
    position: relative;
    z-index: 1;
}

.content {
    background: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    width: 450px;
}

.footer {
    background: #000;
    position: fixed;
    bottom: 0;
    width: 100%;
}