Playing around with some 'dark mode' colors.

app/css/nespaint.css

 body{
-  background-color:#666;
+  background-color:#303030;
+}
+
+.pure-menu{
+  background-color:#6200EE;
+  color:#FFF;
 }
 
 #painter{
-  background-color:#444;
+  background-color:#212121;
   width:100%;
   height:100%;
 }
 
 
 span.color-NES-06{
+  background-color:#000;
   color:#A80020;
 }
 

app/js/main.js

       var cb = Math.floor(Math.random() * 3);
       var index = (cb*16)+ca;
       el.style.color = pal[index];
+      el.style["background-color"] = "#000";
     });
   }
 }

index.html

         <a class="pure-menu-heading" href="">
           <span class="color-NES-06">NES </span>
           <span class="color-NES-random">P</span><span class="color-NES-random">a</span><span class="color-NES-random">i</span><span class="color-NES-random">n</span><span class="color-NES-random">t</span>
-        </a>
-        <ul class="pure-menu-list">
-          <li class="pure-menu-item pure-menu-selected">
+        </a> 
+      </div>
+    </div>
+
+    <div class="content-wrapper">
+      <div class="pure-g">
+        <div class="pure-u-1-8">
+          <div class="pure-button-group" role="group" aria-label="...">
             <button emit="modal-open" emit-args='{"id":"Welcome"}' class="pure-button">
               <i class="fa fa-brush"></i>
             </button>
-          </li>
-          <li class="pure-menu-item">
             <button emit="modal-open" emit-args='{"id":"Welcome"}' class="pure-button">
               <i class="fa fa-eraser"></i>
             </button>
-          </li>
-        </ul>
-      </div>
-    </div>
-
-    <div class="content-wrapper">
-      <div class="pure-g">
-        <div class="pure-u-1-8"></div>
-        <div class="pure-u-3-4">
+            <button class="pure-button pure-button-active">
+              <i class="fa fa-eye-dropper"></i>
+            </button>
+          </div>
+        </div>
+        <div class="pure-u-2-3">
           <canvas id="painter" width:"128" height:"256"></canvas>
         </div>
       </div>