How to start a new line with a particular item with Flexbox?

Question

This is a very simple exercise but I can\'t seem to find a neat way to solve it (just started learning about HTML and CSS).

Answer 1

* {
  margin: 0;
  box-sizing: border-box;
}

section {
  display: flex;
  flex-wrap: wrap;
  width: 100vw;
  height: 100vh;
}

section > div {
  flex-basis: 25%;
  justify-content: space-around;
  background: rgba(0, 0, 0, 0.1);
  text-align: center;
}

section > div:last-child {
  flex-basis: 100%;
}

  

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