CSS tweaks to import/export (#121)

playground/index.html

@@ -37,7 +37,7 @@
                  
                 <input type="button" value="Import from XML" onclick="fromXml()" id="import">
                 <br><br>
-                <textarea id="importExport" style="width: 480px; height: 360px"></textarea>
+                <textarea id="importExport"></textarea>
             </p>
         </div>
     </div>

playground/playground.css

@@ -35,3 +35,12 @@ a {
 #tab-blockexplorer, #tab-threadexplorer, #tab-importexport {
     display: none;
 }
+
+#importExport {
+    width: 400px;
+    height: 360px;
+    background: rgb(36,36,36);
+    color: rgb(217,217,217);
+    font-family: monospace;
+    font-size: 10pt;
+}