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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 */
.block {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: #f1f1f1;
  cursor: pointer;
  font-family:sans-serif;
  font-size: 26pt;
  border-style: inset;
}





            /* 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>

                           <!-- Control buttons. "Add" while checking multiple boxes combines results. "Overlap" shows where results intersect.-->
                     <div class="options">
  <label><input type="radio" name="operation" value="union" id="op-union" checked>ADD</label>
  <label><input type="radio" name="operation" value="intersection" id="op-inter"> OVERLAP</label>
</div>

  <!--Here you can define what filters you will use and how many. Make sure all values for a given filter are all written the same everywhere. -->
<div class="categories">
  <span class="category">
    <input type="checkbox" value="filter1" id="cat-filter1">
    <label for="cat-filter1">FILTER 1</label>
  </span>
  <span class="category">
    <input type="checkbox" value="filter2" id="cat-filter2">
    <label for="cat-filter2">FILTER 2</label>
  </span>
   <span class="category">
    <input type="checkbox" value="filter3" id="cat-filter3">
    <label for="cat-filter3">FILTER 3</label>
  </span>
</div>
      </div> 
            </div>
           
                 
          
                <div id="content-container" style="flex-grow: 1;" id="top">


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

            </div>
<script>
var checkboxes = document.querySelectorAll(".categories input");
for(var i = 0; i < checkboxes.length; i++) {
  checkboxes[i].addEventListener("change", filter);
}
var radios = document.getElementsByName("operation");
for(var i = 0; i < radios.length; i++) {
  radios[i].addEventListener("change", filter);
}
filter();
function filter() {
  var i, j;

  // Choose an operation
  var operation = document.getElementById("op-union").checked ? "union" : "intersection";

  // Get the selected categories
  var checkboxes = document.querySelectorAll(".categories input");
  var categories = [];
  var c;
  for(i = 0; i < checkboxes.length; i++) {
    if(checkboxes[i].checked) {
      c = checkboxes[i].value;
      categories.push(c);
    }
  }

  // Apply the filter
  var items = document.querySelectorAll(".filterDiv");
  var item, show;
  for(i = 0; i < items.length; i++) {
    item = items[i];
    if(categories.length == 0) {
      show = true;
    } else if(operation == "union") {
      // Union: Only one of the categories needs to exist
      show = false;
      for(j = 0; j < categories.length; j++) {
        if(item.classList.contains(categories[j])) {
          show = true;
          break;
        }
      }
    } else {
      // Intersection: All of the categories must apply
      show = true;
      for(j = 0; j < categories.length; j++) {
        if(!item.classList.contains(categories[j])) {
          show = false;
          break;
        }
      }
    }

    if(show) {
      item.classList.add("show");
    } else {
      item.classList.remove("show");
    }
  }
}
</script>
            
            </body>
           
        </div>
        </html>
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