html { background: #112; color: #ddd; font-family: sans-serif; }
body { max-width: 720px; margin: 0 auto; padding: 10px; }

h1, h2 { display:inline-block; margin: 20px 0 0;}
hr { border: 1px solid #666; margin: 10px 0; }
a { color: #aac; }
img { max-width: 100%; }
blockquote { font-style: italic; white-space:pre-wrap; }

.videoWrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    padding-top: 25px;
    height: 0;
}
.videoWrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}