HTML5 Boilerplate

• https://github.com/h5bp/html5-boilerplate/blob/master/doc/extend.md

• https://github.com/h5bp/html5-boilerplate/blob/master/css/main.css#L83

.browsehappy {
    margin: 0.2em 0;
    background: #ccc;
    color: #000;
    padding: 0.2em 0;
}