CodePen Embed - 横幅が30vwだったときの表示

<div class="block vw-30">30vwで指定されています</div>

* {
  box-sizing: border-box;
}

.block {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 300px;
  margin-bottom: 20px;
  margin-left: -8px;
  padding: 16px;
  color: #fff;
  background: #0000ff;
}

.vw-30 {
  width: 30vw;
}

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