html { width: 100%; height: 100%; background-color: white; } body { font-family: system-ui; font-size: 1.0rem; line-height: 1.1; background-image: url(https://duncanmoran.net/images/gatAbrainBWsRGB.jpeg); background-position:center; /* -o-background-size:cover; -moz-background-size:cover; -webkit-background-size:cover; */ background-size:100% 100%; background-repeat:no-repeat; } hr { margin-top: 24px; } footer { margin-left: 12px; margin-top: 5px; } h1 { font-size: 3.25rem; color: blue; text-align: center; } h2{ color: blue; text-align: center; } h3{ color: black; text-align: center; } h4{ margin-left: 12px; color: black; } p { color: black; margin: 20px; }