more styling tweaks

Author: drammock

src/pydata_sphinx_theme/assets/styles/components/_readthedocs-switcher.scss

@@ -2,10 +2,11 @@
   position: relative !important;
   font-family: inherit !important;
   a {
-    color: var(--pst-color-text-base);
+    color: var(--pst-color-link) !important;
     text-decoration: unset;
     @include link-style-hover;
     &:hover {
+      color: var(--pst-color-link-hover);
       background-color: var(--pst-color-surface);
     }
   }
@@ -49,10 +50,14 @@
     dd {
       border-color: var(--pst-color-border) !important;
       border-radius: var(--bs-dropdown-border-radius) !important;
+      border-style: solid !important;
       border-width: 1px !important;
       a {
-        color: unset;
+        color: var(--pst-color-text-base) !important;
         @include link-style-hover;
+        &:hover {
+          color: var(--pst-color-link-hover);
+        }
       }
     }
   }