fix: doc version dropdown (#1592)

Co-authored-by: Young <iskyex@outlook.com>
diff --git a/doc/src/theme/DocSidebar/styles.module.css b/doc/src/theme/DocSidebar/styles.module.css
index a498825..f1a081d 100644
--- a/doc/src/theme/DocSidebar/styles.module.css
+++ b/doc/src/theme/DocSidebar/styles.module.css
@@ -7,6 +7,7 @@
 
 :root {
   --collapse-button-bg-color-dark: #2e333a;
+  --text-color-primary:#e8433e;
 }
 
 @media (min-width: 997px) {
@@ -124,8 +125,18 @@
 
 .sidebarVersionSwitch a {
   display: inline-block;
+  pointer-events: none;
+}
+
+.sidebarVersionSwitch ul a {
+  pointer-events:all;
 }
 
 .sidebarVersionSwitch div {
   display: inline-block !important;
 }
+
+.sidebarVersionSwitch div:hover{
+  cursor: pointer;
+  color: var(--text-color-primary);
+}