@media only screen and (min-width: 500px) and (max-width: 789px) {
  html {
    font-size: 12px;
  }
  body {
    width: 100%;
    margin: auto;
  }
  .logo {
    width: 100px;
    height: 100px;
    float: left;
    margin: 1.3% 5% 1.5% 0;
  }
  body header .header-center {
    width: 90%;
  }
  header h1 {
    font-size: 3.5rem;
  }
  nav ul {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    width: 90%;
    margin: 0 5%;
  }

  nav ul li:nth-child(even) {
    display: flex;
    justify-content: flex-end;
  }
  nav ul li:nth-child(odd) {
    display: flex;
    justify-content: flex-start;
  }

  nav li {
    width: 40%;
    margin: 0;
  }
  main div {
    width: 90%;
    margin: auto;
  }
}