Divided the custom css into several files

It is more obvious what is supported.

dark_tasks.css

@@ -0,0 +1,46 @@
+/* 
+ * Plugin: Tasks
+ */
+#tasklists li.selected span.listname, 
+#tasklists li.selected {
+  color: #333 !important;
+  background-color: #aaa;
+}
+
+#tasklists li span.listname, 
+#tasklists li {
+  color: #eee !important;
+  background-color: #333;
+}
+
+#taskedit ul.tagedit-list,
+#taskedit li,
+#taskedit a {
+  color: #eee;
+  background-color: #333;
+  border: 1px solid #555;
+}
+
+#taskedit li.ui-tabs-active a {
+  color: #333;
+  background-color: #aaa;
+  font-weight: bold;
+}
+
+#taskedit li a.tagedit-close {
+  border: 0px;
+}
+
+li.tagedit-listelement,
+#taskedit input {
+  color: #eee !important;
+  background: #333 !important;
+}
+
+#taskshow {
+  color: #eee !important;
+}
+
+.tagcloud li{
+  color: #eee;
+}