CodePen Embed - column-gap and row-gap in Flexbox

<div class="flex">
  <div>Item</div>
  <div>Item</div>
  <div>Item</div>
  <div>Item</div>
  <div>Item</div>
  <div>Item</div>
  <div>Item</div>
</div>

* {
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  padding: 20px 0;
  background-color: #18191c;
  font-family: 'Roboto', sans-serif;
  color: #ffffff;
  font-size: 20px;
  line-height: 1.5;  
}

.flex {
  width: 800px;
  border: 5px solid rgb(75, 70, 74);
  display: flex;
  flex-wrap: wrap;
  row-gap: 30px;
  column-gap: 20px;
}

.flex > * {
  flex: 1 1 200px;
  background-color: #5133DF;
  padding: 10px;
  text-align: center;
}

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