html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: #3E3E3E;
}

main {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
    margin: auto;
}

main a img {
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    width: 10%;
}

footer {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 10%;
    margin: auto;
}
