html {
    font-size: 10px;
}
#central {
    width: 30rem;
    height: 30rem;
    background: radial-gradient(rgb(232, 191, 8), rgb(224, 148, 6), rgb(204, 67, 89));
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    border-radius: 50%;
}
a{
    font-size: 5rem;
}
a:hover {
    text-decoration: none;
    border: solid black 15px;
}