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                <div class="container">
  <div class="item item1">1</div>
  <div class="item item2">2</div>
  <div class="item item3">3</div>
  <div class="item item4">4</div>
  <div class="item item5">5</div>
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                :root {
  --yellow: #ffc600;

.container {
  display: grid;
  grid-gap: 20px;
  grid-template-columns: repeat(10, 1fr);
  grid-auto-flow: dense;

.item {
  display: grid;
  justify-content: center;
  align-items: center;
  border: 5px solid rgba(0, 0, 0, 0.03);
  border-radius: 3px;
  font-size: 35px;
  background-color: var(--yellow);
.item:nth-child(6n) {
  background: cornflowerblue;
  grid-column: span 6;

.item:nth-child(8n) {
  background: tomato;
  grid-column: span 2;
.item:nth-child(9n) {
  grid-row: span 2;
.item18 {
  background: greenyellow !important;
  grid-column-end: -1 !important;

.item p {
  margin: 0 0 5px 0;