A neat gradient line snippet. Dependent on flexbox_functions.php. You could use the straight flexbox code or some other alignment system.

gradient_line

.gradient_line{ 
    <?php flexbox::align_items_center(); ?>
    height: 1px;
    background: black;
    width: 100%;
    background: -webkit-gradient(linear, 100% 100%, 0 0, from(white), to(white), color-stop(50%, black));
    background: -moz-linear-gradient(left, #FFF 0%, #444 50%, #fff 100%);
    background: -o-gradient(linear, 0 0, 100% 0, from(white), to(white), color-stop(50%, black));
    clear:all;
}