style.css

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;600&display=swap');

body, html {
    font-family: 'Inter', sans-serif;
    font-weight: 300;
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

.video-container {
    position: relative;
    height: 0;
    overflow: hidden;
    padding-bottom: 62.25%;
    flex-basis: 100%;
    margin-bottom: 2rem;
    margin-top: 2rem;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

main {
    max-width: 800px;
    width: 100%;
    flex-direction: column;
    justify-content: center;
    align-content: center;
    text-align: center;
    padding: 1rem;
}

#bitcoin-design-footer {
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    padding: 2rem;
}

#bitcoin-design-footer img {
    width: 200px;
}

#wrapper {
    display: flex;
    width: 100%;
    min-height: 100%;
    align-items: center;
    justify-content: center;
}

a {
    color: #F7931A;
}

.links {
    display: flex;
    justify-content: center;
    flex-direction: column;
}

.links li {
    list-style-type: none;
}

.links li a {
    background-color: #F7931A;
    padding: 1rem;
    margin: 0.5rem 0.5rem;
    color: #fff;
    text-decoration: none;
    border-radius: 0.25rem;
    display: inline-block;
}

@media (min-width: 600px) {
    .links {
        flex-direction: row;
        margin: 0 0.5rem;
    }
}