Make the fullscreen button larger

xray.html

@@ -33,7 +33,7 @@
             <input type="number" id="softness-input" placeholder="25" value="25">
             <input type="range" id="softness-slider" min="0" max="100" value="25">
         </label>
-        <button id="fullscreen-button">Fullscreen</button>
+        <button class="large" id="fullscreen-button">Fullscreen</button>
     </div>
     
     <div id="fill-div">