website/scss/_menueMobile.scss

#burgerMenue {
  position: absolute;
  top: 10px;
  right: 10px;
  display: none;
  cursor: pointer;

  .bar1, .bar2, .bar3 {
    width: 35px;
    height: 5px;
    background-color: $text-color;
    margin: 6px 0;
    transition: 0.4s;
  }
  &.change .bar1 {
    -webkit-transform: rotate(-45deg) translate(-9px, 6px);
    transform: rotate(-45deg) translate(-9px, 6px);
  }

  &.change .bar2 {opacity: 0;}

  &.change .bar3 {
    -webkit-transform: rotate(45deg) translate(-8px, -8px);
    transform: rotate(45deg) translate(-8px, -8px);
  }
}

@media only screen and (max-width: $mobile-max-width) {
  #burgerMenue{
    display: inline-block;
  }

  .visible{
    display: inline-grid !important;
  }

  .mainMenueContainer{
    display: none;

    text-align: left !important;
    background-color: $back-color-3;
    width: 100% !important;

    a {
      text-align: left !important;
      border-bottom: #111721 solid 2px;
      width: 100% !important;
    }

    .dropdown-content{
      display: block;
      position: relative;
      left: 0;
      transform: none;
      width: 100%;
      a{
        padding-left: 40px !important;
        border-bottom: #111721 solid 2px;
      }
    }
  }
  #mainMenue{
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
  }
}