Fix some bugs

src/page/theme-switcher/theme-switcher.scss

@@ -3,9 +3,15 @@
 @include responsive using($vars) {
   input[type='checkbox']#theme-switcher {
     @include on-large-screen {
-      position: fixed;
-      top: map_get($vars, $normal-margin);
-      right: map_get($vars, $normal-margin);
+      position: absolute;
+      top: -1 * map_get($vars, $small-margin);
+      right: calc(
+        -1 * (50vw - #{map_get($vars, $body-width)} / 2) + #{map_get(
+            $vars,
+            $normal-margin
+          )}
+      );
+      transform: translateY(-100%);
     }
 
     @include on-small-screen {