<section class="ram">
  <div class="block">1</div>
  <div class="block">2</div>
  <div class="block">3</div>
  <div class="block">4</div>
  <div class="block">5</div>
  <div class="block">6</div>
  <div class="block">7</div>
  <div class="block">8</div>
  <div class="block">9</div>
  <div class="block">10</div>
</section>

.ram {
  display: grid;
  gap: 1em;
  grid-template-columns: repeat(auto-fit, minmax(10em, 1fr));
  /* Uncomment the line below to prevent blocks from fitting the whole space */
  /* grid-template-columns: repeat(auto-fill, minmax(10em, 1fr)); */
}
.block {
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  height: 10em;
  background-color: red;
  font-size: 1.5rem;
  border-radius: 1em;
}
.block:nth-child(2),
.block:nth-child(6) {
  background-color: green;
}
.block:nth-child(3),
.block:nth-child(7) {
  background-color: blue;
}
.block:nth-child(4),
.block:nth-child(8) {
  background-color: black;
}
.block:nth-child(5),
.block:nth-child(10) {
  background-color: gold;
}