Change dark and light themes

static/css/general.css

@@ -62,7 +62,7 @@ footer {
 
 .globalnav-element {
   display: block;
-  background-color: #ddd;
+  background-color: rgb(90% 90% 90%);
   text-align: center;
   flex-basis: 0;
   flex-grow: 1;
@@ -188,12 +188,12 @@ th {
 
 @media (prefers-color-scheme: dark) {
   html {
-    background-color: #111;
+    background-color: black;
     color: white;
   }
 
   .globalnav-element {
-    background-color: #222;
+    background-color: rgb(10% 10% 10%);
   }
 
   code {
@@ -218,7 +218,7 @@ th {
   }
 
   .globalnav-element {
-    background-color: #ddd;
+    background-color: rgb(90% 90% 90%);
   }
 
   code {