<div class="con">
  <div class="item item-1">1</div>
  <div class="item item-2">2</div>
<!--   <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div>
  <div class="item item-2">2</div> -->
</div>
.con {
  display: grid;
  
  grid-template-columns: 200px auto;
/*   grid-template-rows: calc(100vh - 20px); */
  
/*   grid-template-columns: repeat(12, 1fr); */
}

.item {
  font-size: 2em;
  text-align: center;
  /* line-height: 100px; */
  border: 1px solid #e5e4e9;
}

.item-1 {
  background-color: #ef342a;
}

.item-2 {
  background-color: #f68f26;
}

.item-3 {
  background-color: #4ba946;
}

.item-4 {
  background-color: #0376c2;
}

.item-5 {
  background-color: #c077af;
}

.item-6 {
  background-color: #f8d29d;
}

.item-7 {
  background-color: #b5a87f;
}

.item-8 {
  background-color: #d0e4a9;
}

.item-9 {
  background-color: #4dc7ec;
}

External CSS

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External JavaScript

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