fix(select): Disable ripple/state pseudos for native multiselect (#1781)

packages/mdc-select/mdc-select.scss

@@ -353,6 +353,16 @@ $mdc-select-menu-transition: transform 180ms $mdc-animation-standard-curve-timin
     &:last-child {
       margin-bottom: 8px;
     }
+
+    // Browsers are inconsistent in what they allow us to override, and some (e.g. Chrome) don't allow overriding the
+    // OS-determined selection color, which states styles are not going to play well with.
+    // Additionally, Firefox seems to ignore position: relative on option elements, which causes the pseudo elements
+    // that we use for ripple/states to position and size themselves relative to the entire body instead.
+    // Disabling states-specific styles on multi-select options altogether is the most straightforward recourse.
+    &::before,
+    &::after {
+      content: none;
+    }
   }
   // stylelint-enable plugin/selector-bem-pattern