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              <div class="box">
  CSS Custom Property
              .box {
  /* --box-margin은 정의되지 않았기 때문에 20px이 사용됩니다. */
  margin: var(--box-margin, 20px);
  /* --box-color가 정의되지 않았다면 --main-color 변수가 사용됩니다. */
  --main-color: gold;
  background: var(--box-color, var(--main-color));

  /* common style */
  width: 300px;
  font-size: 15px;
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