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-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;
  }
}

.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;
    }
  }
}