<div class="container">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5<br>has more content.</div>
</div>

body {
  padding: 20px;
  font: 1em Helvetica Neue, Helvetica, Arial, sans-serif;
  display: flex;
  justify-content: center;
}

* {box-sizing: border-box;}

p {
  margin: 0 0 1em 0;
}

.container {
  width: 500px;
  border: 5px solid rgb(111,41,97);
  border-radius: .5em;
  padding: 10px;
  display: grid;
  grid-template-columns: 1fr 2fr 100px;
  grid-gap: 20px;
}

.container > div {
  padding: 10px;
  background-color: rgba(111,41,97,.3);
  border: 2px solid rgba(111,41,97,.5);
}