fix issue with dropdown cuttoff on pages with less content/smaller sidebar

Author: Aliserag

src/theme/DocActionsDropdown/styles.module.css

@@ -56,16 +56,17 @@
 }
 
 .dropdownMenu {
-  position: absolute;
-  top: 100%;
-  left: 0;
-  right: 0;
+  position: fixed;
+  width: calc(100% - 30px);
+  max-width: 300px;
   background: var(--ifm-background-color);
   border: 1px solid var(--ifm-color-emphasis-200);
   border-radius: 4px;
-  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
-  z-index: 1000;
+  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
+  z-index: 9999;
   margin-top: 0.5rem;
+  max-height: 80vh;
+  overflow-y: auto;
 }
 
 .menuItem {