JSFiddle - React, Tailwind, and code Playground

HTML

<div class="table">
  <div class="row">
    <div class="item item-a">A</div>
    <div class="item item-b">B</div>
  </div>
  <div class="row">
    <div class="item rowspan-2 item-a">aa</div>
    <div class="item  item-b">bb</div>
    <div class="item  item-b">bb</div>
  </div>
  <div class="row">
    <div class="item item-a">a</div>
    <div class="item item-b">b</div>
  </div>
  <div class="row">
    <div class="item rowspan-3 item-a">a</div>
    <div class="item item-b">b</div>
    <div class="item item-b">b</div>
    <div class="item item-b">b</div>
  </div>
</div>

SCSS

.table {
  display: grid;
  text-align: center;
  width: 50%;
  background: #efefef;
}

.item {
  display: grid;
  border: 1px solid #000;
  align-items: center;
  padding: 10px;
}

.row {
  display: grid;
  grid-template-columns: .5fr .5fr;
  &:nth-child(even) {
    background: #f77;
  }
}

@mixin rowspan($n) {
  .rowspan-#{$n} {
    grid-row: span $n;
  }
}

@for $i from 1 through 10 {
  @include rowspan($i);
}

.item-a {
  grid-column: 1;
}

.item-b {
  grid-column: 2;
}