Source: dist/css/layout_demo.css, line 1311
Example
<a href="" class="bg_black-3 br_none br_radius c_black-7 cursor_not-allowed disabled font_1 font_2:md font_medium h:bg_black-3 h:c_black-7 h:undecorated undecorated inline-block m-t_0:md m-t_3 opacity_5 p-x_4 p-y_3 shadow_emboss-light text_center w_100 w_auto:md">Coming Soon</a>