value tweak, lint fix

Author: Simek

website/src/components/DocsSecondaryNav/styles.module.css

@@ -166,7 +166,7 @@ button.copyPageButton {
 
 .copyPageDropdown {
   border-color: var(--ifm-table-border-color) !important;
-  margin-top: -2px;
+  margin-top: -3px;
 
   button[class^="dropdownItem"] {
     border-bottom-color: var(--ifm-table-border-color) !important;

website/src/css/docs-secondary-nav.scss

@@ -108,7 +108,7 @@ html.plugin-docs {
     overflow: visible;
 
     // Make sure that menu does not close on hover, with dropdown portion detached via transform
-    &::before {
+    &:before {
       content: "";
       position: absolute;
       height: 5px;