The global .container is padding-free at >=992px (1200px dual-column
geometry), but the header slider card container re-added 15px side
padding, visibly insetting the icon cards ~15px per side relative to
the main content below. Zibll keeps header and content boxes equal by
sharing one container model; drop the local gutter so AKSRT does the
same. Mobile keeps its 15px via the <=991.98px media rule.