.blink { animation: blink 1s steps(5, start) infinite; -webkit-animation: blink 1s steps(5, start) infinite; } @keyframes blink { to { visibility: hidden; } } @-webkit-keyframes blink { to { visibility: hidden; } } pre { overflow-x: auto; background-color: transparent; background: black; color: lime; } h1, h2, h3, h4, h5, h6 { font-weight: normal; } ul pre { border:none; } .dl-horizontal dt { }