guide.js

    var acc = document.getElementsByClassName("accordion");
    var i;
    
    for (i = 0; i < acc.length; i++) {
      acc[i].addEventListener("click", function() {
        /* Toggle between adding and removing the "active" class,
        to highlight the button that controls the panel */
        this.classList.toggle("active");
    
        /* Toggle between hiding and showing the active panel */
        var panel = this.nextElementSibling;
        if (panel.style.display === "block") {
          panel.style.display = "none";
        } else {
          panel.style.display = "block";
        }
      });
    }
    var acc = document.getElementsByClassName("accordion");
    var i;
    
    for (i = 0; i < acc.length; i++) {
      acc[i].addEventListener("click", function() {
        this.classList.toggle("active");
        var panel = this.nextElementSibling;
        if (panel.style.maxHeight) {
          panel.style.maxHeight = null;
        } else {
          panel.style.maxHeight = panel.scrollHeight + "px";
        }
      });
    }