Backed out changeset a9d64f4b6a3f (bug 1500018) for devtools failures at browser/base/content/test/static/browser_parsable_css.js on a CLOSED TREE

devtools/client/netmonitor/src/assets/styles/Toolbar.css

@@ -9,6 +9,17 @@
   line-height: 23px;
 }
 
+/* This should be global style for all panels at some point */
+.monitor-panel .devtools-button {
+  background-color: transparent;
+}
+
+/* This should be global style for all panels at some point */
+.theme-light .monitor-panel .devtools-button.checked {
+  color: var(--grey-90);
+  background-color: var(--grey-90-a10);
+}
+
 .devtools-toolbar-container {
   height: auto;
   flex-wrap: wrap;