Tim: Frage zum Wiki-Artikel „dropdown“

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Also ich schicke euch mal meinen gesamten quelltext:

HTML:

 <html>
 <head>
 <link rel="stylesheet" href="pos.css">
<link rel="stylesheet" href="style.css">
<script src="dropdown.js" type="text/javascript"></script>
 </head>
 <body>
 <div class="wiki">
 <div class="dropdown">
  <button onclick="myFunction()" class="dropbtn">WIKI</button>
  <div id="myDropdown" class="dropdown-content">
    <a href="main_test1.html">test1</a>
    <a href="main_test2.html">test2</a>
    <a href="homepage.html">home</a>
  </div>
</div>
</div>
</body>
</html>

CSS:

 /* Dropdown Button */
.dropbtn {
  background-image: url("Bilder\wiki.png");
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

/* Dropdown button on hover & focus */
.dropbtn:hover, .dropbtn:focus {
    background-color:black;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
    position: relative;
    display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

/* Links inside the dropdown */
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}

/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show {display:block;}

javascript:

/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}

// Close the dropdown menu if the user clicks outside of it
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {

    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}

Und diese Bild "Bilder\wiki" soll halt der Button sein das Bild ist auch in der richtigen Größe für den Button etc.