re #89: fixed using non-compliant color

src/settings.html

@@ -49,7 +49,7 @@ ul > li {
     <input type="radio" name="displayTextSize" id="displayTextSizeNormal" value="13px"><label data-i18n="settingsMatrixDisplayTextSizeNormal" for="displayTextSizeNormal"></label>
     <input type="radio" name="displayTextSize" id="displayTextSizeLarge" value="16px"><label data-i18n="settingsMatrixDisplayTextSizeLarge" for="displayTextSizeLarge"></label>
     <li style="margin-top:0.5em;">
-        <span data-i18n="settingsSubframeColor"></span> <input id="subframe-color" type="color" value="#c00">
+        <span data-i18n="settingsSubframeColor"></span> <input id="subframe-color" type="color" value="#cc0000">
         &ensp;<span data-i18n="settingsSubframeOpacity"></span> <input id="subframe-opacity" type="range" min="0" max="100" value="100">
         &ensp;<span id="subframe-color-demo">&nbsp;</span>
 </ul>