/** 2. Clearfix **/

    /**
     * For modern browsers
     * 1. The space content is one way to avoid an Opera bug when the
     *    contenteditable attribute is included anywhere else in the document.
     *    Otherwise it causes space to appear at the top and bottom of elements
     *    that are clearfixed.
     * 2. The use of `table` rather than `block` is only necessary if using
     *    `:before` to contain the top-margins of child elements.
     */
    .cf:before,
    .cf:after {
        content: " "; /* 1 */
        display: table; /* 2 */
    }

    .cf:after {
        clear: both;
    }

    /**
     * For IE 6/7 only
     * Include this rule to trigger hasLayout and contain floats.
     */
    .cf {
        *zoom: 1;
    }