Use JS injection to allow iframe-specific I2PTunnel styling

installer/resources/themes/console/dark/default.css

@@ -18,6 +18,10 @@ body {
      box-sizing: border-box;
 }
 
+body.iframed {
+     background: transparent url('images/transparent.gif') !important;
+}
+
 div {
      -moz-box-sizing: border-box;
      box-sizing: border-box;
@@ -213,6 +217,10 @@ hr {
      padding: 10px 20px;
 }
 
+.iframed .panel {
+     margin: 16px auto -7px auto !important;
+}
+
 .panel .footer {
      float: right;
      padding: 4px;