��<!DOCTYPE html><html><head><style>.grid { display: grid; grid-template-columns: repeat(12, 1fr); } .col-span-4 { grid-column: span 4 / span 4; } .col-span-8 { grid-column: span 8 / span 8; }</style></head><body><div class="grid"><div class="col-span-4" style="background: red;">4</div><div class="col-span-8" style="background: blue;">8</div></div></body></html>