header {
  nav {
    display: flex;
    justify-content: space-between;
    padding: 2em;
    width: auto;
    margin: auto 0;
    .contents {
      display: flex;
      align-items: center;

      ul {
        list-style: none;
        display: flex;
        justify-content: space-around;
        padding: 2em;
      }
    }
  }
}