body {
    margin: 0; 
    font-family: helvetica, sans-serif;
}
header, footer, main { padding-left: 2rem; padding-right: 2rem;}
footer {
    border-top: thin solid black;
}

a:link,
a:visited,
a:hover,
a:active {
    text-decoration: none;
    color: blue;
}

a:hover,
a:active {
    text-decoration: underline;
}