@media screen and (max-width: 721px) {
  body {
    font-size: 1.25em;
  }

  .main-web .main-title {
    flex-direction: column;
  }
  .main-web .main-title > section {
    margin: 0;
    margin-bottom: 16px;
  }
  .main-web .main-title .main-logo h1 {
    display: none;
  }
  .main-web .main-title .menu-burger-icon img {
    display: block;
  }
  .main-web .main-title nav.nav-hide {
    display: none;
  }
  .main-web .main-title nav.nav-show {
    display: inherit;
  }
  .main-web .main-content .main-content-section {
    flex-direction: column;
    margin: 0 8px;
    width: inherit;
  }
  .main-web .main-content .main-content-section aside {
    flex-direction: column;
    flex-wrap: wrap;
    width: initial;
    margin: 0;
  }
  .main-web .main-content .main-content-section aside > * {
    flex: 1;
    height: 100%;
  }
  .main-web .main-footer {
    display: none;
    flex: 1;
  }
}