@media screen and (max-width: 600px) {
  .menu-icon {
    display: flex;
    background: none;
    border: none;
    cursor: pointer;
  }

  .menu-icon #burger {
    display: block;
    width: 20px;
    border-top: 2px solid;
    transition: .2s;
  }

  .menu-icon #burger::after, .menu-icon #burger::before {
    content: '';
    display: block;
    width: 20px;
    height: 2px;
    background-color: currentColor;
    margin-top: 5px;
    position: relative;
    transition: .3s;
  }
  
  .menu {
    display: block;

    text-align: center;

    width: 100%;
    height: 0px;

    position: absolute;
    top: 7rem;
    right: 0px;
    z-index: 1000;

    visibility: hidden;
    overflow-y: hidden;
    transition: .6s;
  }
  
  .menu a {
    padding: 1rem 0;
    margin: 0 1rem;
    border-bottom: 2px solid rgba(0, 0, 0, .05);
  }

  nav.active .menu {
    height: 20rem;
    visibility: visible;
    overflow-y: auto;
  }

  nav.active .menu-icon #burger {
    border-top-color: transparent;
  }

  nav.active .menu-icon #burger::before {
    transform: rotate(135deg);
  }

  nav.active .menu-icon #burger::after {
    transform: rotate(-135deg);
    top: -7px;
  }

}