body {
    margin: 0;
    padding: 0;
    height: 100vh;
    font-family: 'Marvel', sans-serif;
    color: #FAFAFA;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-color: #464646;
    animation: rotateBackground 70s infinite;
}

.content {
    text-align: center;
    width: 960px;
    height: 200px;
    position: absolute;
    top: 30%;
    left: 50%;
    margin-left: -480px;
    font-weight: normal;
    text-shadow: 0px 5px 5px rgba(0, 0, 0, 0.3);
}

@media screen and (min-width: 601px) {
    h1 {
        font-size: 85px;
        letter-spacing: 20px;
    }

    h3 {
        font-size: 30px;
        letter-spacing: 4px;
        margin-top: -50px;
    }
}

/* If the screen size is 600px wide or less, set smaller font-size */
@media screen and (max-width: 600px) {
    h1 {
        font-size: 50px;
        letter-spacing: 10px;
    }

    h3 {
        font-size: 18px;
        letter-spacing: 3px;
        margin-top: -35px;
    }
}

span {
    text-indent: -100px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    display: inline-block;
}

/* Rotating Background */
@keyframes rotateBackground {
    
    0% {
        background-image: url('../images/bg-landscape-50.jpg');
    }

    20% {
        background-image: url('../images/bg-couple-50.jpg');
    }

    40% {
        background-image: url('../images/bg-ironman-50.jpg');
    }

    60% {
        background-image: url('../images/bg-guitar-50.jpg');
    }

    80% {
        background-image: url('../images/bg-mx-50.jpg');
    }

    100% {
        background-image: url('../images/bg-jump-50.jpg');
    }
}