.youtube-grid{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(6,100px);gap:2px;place-items:stretch;grid-template-areas:"t1 t1 t1 t1 t1 t2 t2 t2 t2" "t1 t1 t1 t1 t1 t2 t2 t2 t2" "t1 t1 t1 t1 t1 t2 t2 t2 t2" "t4 t4 t4 t4 t3 t3 t3 t3 t3" "t4 t4 t4 t4 t3 t3 t3 t3 t3" "t4 t4 t4 t4 t3 t3 t3 t3 t3"}.youtube-grid .pl1-tile{background-image:url('/documents/images/coltene/Coltene-ICTA-PL.jpg');grid-area:t1}.youtube-grid .pl2-tile{background-image:url('/documents/images/coltene/Coltene-Endo-PL.jpg');grid-area:t2}.youtube-grid .pl3-tile{background-image:url('/documents/images/coltene/Coltene-Prosthetics-PL.jpg');grid-area:t3}.youtube-grid .pl4-tile{background-image:url('/documents/images/coltene/Coltene-Restoration-PL.jpg');grid-area:t4}@media(max-width:37em){.youtube-grid{grid-template-columns:1fr;grid-template-rows:repeat(4,minmax(200px,auto));grid-template-areas:"t1" "t2" "t3" "t4"}}