diff --git a/ui/index.html b/ui/index.html
index 3754bece..92de3041 100644
--- a/ui/index.html
+++ b/ui/index.html
@@ -300,7 +300,7 @@
                                 <label for="auto_scroll">Scroll to generated image</label>
                             </div>
                             <div class="dropdown-item">
-                                Preview image size limit:<br/>
+                                <label>Preview image size limit:</label><br/>
                                 <input id="thumbnail_size" name="thumbnail_size" class="editor-slider" type="range" value="70" min="5" max="200" oninput="sliderUpdate(event)"> 
                                 <input id="thumbnail_size-input" name="thumbnail_size-input" size="3" value="70" pattern="^[0-9.]+$" onkeypress="preventNonNumericalInput(event)" oninput="sliderUpdate(event)">&nbsp;%
                             </div>