body {
    width: 100vw;
    margin: 0;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    text-align: center;
    padding: 100px;
}

a:link, 
a:visited { 
    color: red;
}

img {
    width: 300px;
}

@media(max-width: 500px) {
    a {
        padding: 30px;
    }
    img {
        width: 200px;
    }
}