固定TIL 03トップレバー

header {
  height: 75px;
  padding: 1rem;
  color: white;
  background: teal;
  font-weight: bold;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header {
  position: fixed;
  top: 0;
  /* width: 100% */
  left: 0;
  right: 0;
  }

body {
  padding-top: 75px;
  /* 생략 */
}