body {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
    font-family: Helvetica, Arial, sans-serif;
    background-color: #222;
    color: #f4f4f4;
}

main {
    padding: 20px;
}

h1 {
    text-align: center;
    font-size: 3em;
    margin-top: 50px;
    margin-bottom: 40px;
    letter-spacing: 1px;
}

img {
    max-width: 100%;
    height: auto;
    width: 100%;
    object-fit: cover;
    display: block;
    max-width: 960px;
    margin: 0 auto;
    border-radius: 3px;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    -ms-border-radius: 3px;
    -o-border-radius: 3px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

img.mobile {
    display: none;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.35rem;
        margin-top: 30px;
        margin-bottom: 30px;
    }

    img.desktop {
        display: none;
    }

    img.mobile {
        display: block;
    }
}