* {
    color: white;
}
body {
    background-color: black;
}

.centered {
    display: block;
    margin: auto;
    position: relative;
    padding-top: 1em;
    padding-bottom: 2em;
    width: 100%;
    max-height: 95%;
    text-align: center;
    justify-content: center;
    align-items: center;
}
.centered iframe {
    max-width: 75%;
}

footer {
    max-height: 5%;
}

@media screen and (max-width: 900px) {
    h1 {
        font-size: large;
    }
    img {
        width: 72px;
        height: 72px;
    }
}