Three column layout that becomes two columns over one full column on medium and small screens. All three columns become a full column on extra small screens.
Block 1
50% width on medium & small screens, 100% width on extra-small screens.
Block 2
50% width on medium & small screens, 100% width on extra-small screens.
Block 3
100% width on medium, small, and extra-small screens.
Brick 1
full width on small & medium screens, 50% width on all others.
Brick 2
full width on small & medium screens, 50% width on all others.