body {
    font-family: Georgia, 'Times New Roman', Times, serif;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    animation: fadein 3.0s;
    margin: 0;
}

@keyframes fadein {
    0% {opacity: 0;}
    100% {opacity: 1;}
}

header {
    margin: 0;
    background-image: url(../img/diving.jpg);
    background-size: cover;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}