<div class="container" id="container">
  <div class="item">Potato</div>
  <div class="item">Sprout tomato</div>
  <div class="item">Gumbo beet greens.</div>
</div>
body {
  padding: 20px;
  font: 1em Helvetica Neue, Helvetica, Arial, sans-serif;
}

* {box-sizing: border-box;}

p {
  margin: 0 0 1em 0;
}

.container {  
  border: 5px solid rgb(111,41,97);
  border-radius: .5em;
  padding: 10px;
  display: flex;
  width: 500px;
}

.item {
  padding: 10px;
  background-color: rgba(111,41,97,.3);
  border: 2px solid rgba(111,41,97,.5);
  flex: 1 1 auto;
}
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