body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: auto;
    padding: 20px;
}
header { text-align: center; }
#prices, #mining-teaser { margin: 20px 0; }
@media (max-width: 600px) {
    h1 { font-size: 1.5em; }
    #price-data { font-size: 0.9em; }
}