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HTML

              
                  <html>
  <head>
  <style>
        /*
    Credits:
    https://w3schools.invisionzone.com/topic/61299-appling-multiple-filters-to-div-elements/
    For the checkbox filter code!
    
    https://www.w3schools.com/howto/howto_js_filter_elements.asp
    For the single active filter code!
    
    OC Directory by Gildedware (https://gildedware.neocities.org/), customize it as much as you'd like!
    */

.container {
  overflow: hidden;
}

    /*Customize the size and look of the character cards*/
.filterDiv {
  float: left;
  background-color: #f1f1f1;
  color: #000000;
  width: 280px;
  height: 330px;
  text-align: center;
  margin-left: 30px;
  margin-bottom: 30px;
  display: none; /* Hidden by default */
  font-family:sans-serif;
  font-size: 20pt;
}

/* The "show" class is added to the filtered elements */
.show {
  display: block;
}

/* Style the buttons */
.btn {
  border: 2px;
  outline: none;
  padding: 12px 16px;
  background-color: #f1f1f1;
  cursor: pointer;
  font-family:sans-serif;
  font-size: 20pt;
}

/* Add a color background on mouse-over */
.btn:hover {
  background-color: #ddd;
}

/* Add a color background to the active button */
.btn:focus {
  background-color: #0011FF;
  color: white;
  
}


            /* To keep your site RESPONSIVE, make sure this variable matches the width for --container-width UNLESS --container-width is 100% - if it's 100%, you'll need to manually input a breakpoint. */
            @media only screen and (max-width: 800px) {
                .flex {
                    flex-wrap: wrap;
                }

                
</style>

</head>
<body>

<center>
                 <!-- Control buttons. Add in as many filters as you wish! Keep in mind only one filter is active at a time.-->
<div id="myBtnContainer">
  <button class="btn" onclick="filterSelection('all')" autofocus> SHOW ALL</button>
  <p>
  <button class="btn" onclick="filterSelection('filter1')"> FILTER 1</button>
  <button class="btn" onclick="filterSelection('filter2')"> FILTER 2</button>
  <button class="btn" onclick="filterSelection('filter3')"> FILTER 3</button>
 
</div>
                    

<br>

<!-- The filterable elements. Note that some have multiple class names (this can be used if they belong to multiple categories) Make sure the div class always includes filterDiv-->
<div class="container">
  
  <div class="filterDiv filter1 filter3">
    <a href=""><img src="https://cdn.discordapp.com/attachments/992441391718350878/1132120457848569906/icon.png">
    CHARACTER 1</a></div>
  
    <div class="filterDiv filter2">
    <a href=""><img src="https://cdn.discordapp.com/attachments/992441391718350878/1132120457848569906/icon.png">
    CHARACTER 2</a></div>
 
<div class="filterDiv filter3">
    <a href=""><img src="https://cdn.discordapp.com/attachments/992441391718350878/1132120457848569906/icon.png">
    CHARACTER 3</a></div>
  
  <div class="filterDiv filter1 filter2">
    <a href=""><img src="https://cdn.discordapp.com/attachments/992441391718350878/1132120457848569906/icon.png">
    CHARACTER 4</a></div>
  
  <div class="filterDiv filter1 filter2">
    <a href=""><img src="https://cdn.discordapp.com/attachments/992441391718350878/1132120457848569906/icon.png">
    CHARACTER 5</a></div>
  
  
           
    </center>                

              
            </div>
            <script>
            filterSelection("all")
function filterSelection(c) {
  var x, i;
  x = document.getElementsByClassName("filterDiv");
  if (c == "all") c = "";
  // Add the "show" class (display:block) to the filtered elements, and remove the "show" class from the elements that are not selected
  for (i = 0; i < x.length; i++) {
    w3RemoveClass(x[i], "show");
    if (x[i].className.indexOf(c) > -1) w3AddClass(x[i], "show");
  }
}

// Show filtered elements
function w3AddClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    if (arr1.indexOf(arr2[i]) == -1) {
      element.className += " " + arr2[i];
    }
  }
}

// Hide elements that are not selected
function w3RemoveClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    while (arr1.indexOf(arr2[i]) > -1) {
      arr1.splice(arr1.indexOf(arr2[i]), 1);
    }
  }
  element.className = arr1.join(" ");
}

// Add active class to the current control button (highlight it)
var btnContainer = document.getElementById("myBtnContainer");
var btns = btnContainer.getElementsByClassName("btn");
for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", function() {
    var current = document.getElementsByClassName("active");
    current[0].className = current[0].className.replace(" active", "");
    this.className += " active";
  });
}
</script>
            
            </body>
        </html>
    
              
            
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