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sclass HHamburgerMenu {
  S moreContent = "";
  
  S css() {
    ret [[
      .hamburger-menu {
        cursor: pointer;
        position: absolute;
        right: 10px;
        top: 10px;
      }
      
      .hamburger-menu .bar1, .hamburger-menu .bar2, .hamburger-menu .bar3 {
        width: 35px;
        height: 5px;
        background-color: #333;
        margin: 6px 0;
        transition: 0.4s;
        
        /* glowing outline? */
        border: 2px solid #dadada;
        border-radius: 7px;
      }
      
      .hamburger-menu-open .bar1 {
        -webkit-transform: rotate(-45deg) translate(-9px, 6px);
        transform: rotate(-45deg) translate(-9px, 6px);
      }
      
      .hamburger-menu-open .bar2 {opacity: 0;}
      
      .hamburger-menu-open .bar3 {
        -webkit-transform: rotate(45deg) translate(-8px, -15px);
        transform: rotate(45deg) translate(-8px, -15px);
      }
    ]];
  }
  
  S html() {
    ret hcss(css()) + htmlOnly();
  }
  
  S htmlOnly() {
    ret div(
      inner(),
      class := "hamburger-menu",
      onclick := onclick());
  }
  
  swappable S inner() {
    ret emptydiv(class := "bar1")
      + emptydiv(class := "bar2")
      + emptydiv(class := "bar3")
      + moreContent;
  }
  
  swappable S onclick() {
    ret [[this.classList.toggle("hamburger-menu-open");]];
  }
}