hugo-coder-fork/assets/scss/_navigation.scss

.navigation {
  height: 6.0rem;
  width: 100%;
  a, span {
    display: inline;
    font-size: 1.6rem;
    text-transform: uppercase;
    line-height: 6.0rem;
    letter-spacing: 0.1rem;
    @media only screen and (max-device-width : 768px) {
      font-size: 1.4rem;
    }
  }

  .navigation-list {
    float: right;
    list-style: none;
    margin-bottom: 0;
    margin-top: 0;
    @media only screen and (max-device-width : 768px) {
      position: absolute;
      top: 6.0rem;
      right: 0;
      z-index: 5;
      visibility: hidden;
      opacity: 0;
      padding: 0;
      max-height: 0;
      width: 100%;
      background-color: $bg-color;
      border-top: solid 2px $alt-bg-color;
      border-bottom: solid 2px $alt-bg-color;
      transition: opacity 0.25s, max-height 0.15s linear;
    }
    .navigation-item {
      float: left;
      margin: 0;
      position: relative;
      @media only screen and (max-device-width : 768px) {
        float: none !important;
        text-align: center;
        a, span {
          line-height: 5.0rem;
        }
      }
      a, span {
        margin-left: 1.0rem;
        margin-right: 1.0rem;
      }
    }
    .menu-separator {
      @media only screen and (max-device-width : 768px) {
        border-top: 2px solid $fg-color;
        margin: 0 8.0rem;
        span {
          display: none;
        }
      }
    }
  }

  #menu-toggle {
    display: none;
    @media only screen and (max-device-width : 768px) {
      &:checked + label {
        color: $alt-bg-color;
      }
      &:checked + label + ul {
        visibility: visible;
        opacity: 1;
        max-height: 100rem;
      }
    }
  }
  .menu-button {
    display: none;
    @media only screen and (max-device-width : 768px) {
      display: block;
      font-size: 2.4rem;
      font-weight: 400;
      line-height: 6.0rem;
      color: $fg-color;
      cursor: pointer;
    }
  }
}