* {box-sizing: border-box;}

by Nightythehawk

HTML

<!-- Learn about this code on MDN: https://developer.mozilla.org/de/docs/Web/CSS/CSS_Grid_Layout -->

<div class="wrapper">
  <div class="1">One</div>
  <div class="2">Two</div>
  <div class="3">Three</div>
  <div class="4">Four</div>
  <div class="5">Five</div>
  <div class="6">Six</div>
  <div class="7">Six</div>
  <div class="8">Six</div>
  <div class="9">Six</div>
  <div class="10">Six</div>
</div>

CSS

* {box-sizing: border-box;}
.wrapper {
  max-width: 940px;
  margin: 0 auto;
}

.wrapper > div {
  border: 2px solid rgb(233,171,88);
  border-radius: 5px;
  background-color: rgba(233,171,88,.5);
  padding: 1em;
  color: #d9480f;
}.wrapper {
  display: grid;
  grid-template-columns: 1fr;
  grid-gap: 10px;
  grid-template-rows: 1fr;
  grid-auto-rows: minmax(100px, auto);
}
.one {
  grid-column: 1 / 2;
  grid-row: 1;
}
.two { 
  grid-column: 2 / 4;
  grid-row: 1 / 3;
}
.three {
  grid-column: 1;
  grid-row: 2 / 5;
}
.four {
  grid-column: 3;
  grid-row: 3;
}
.five {
  grid-column: 2;
  grid-row: 4;
}
.six {
  grid-column: 3;
  grid-row: 4;
}