body { margin-top: 50px }
body > header, body > footer { text-align: center }
header > h1 { font-size: 30px }
footer { font-size: small; margin-top: 3em }

a:hover, a:active { transition: 0.5s; }

iframe { max-width: 100% !important; }
img { max-width: 100%; }

table { width: 100%; }
th { text-align: right; }
textarea { width: 100%; }