[minor] Fast styling touches to posts's dark mode.

static/style.css

@@ -93,17 +93,17 @@ article.post {
 /* Dark mode. */
 @media (prefers-color-scheme: dark) {
     html {
-        background-color: #0f110e;
+        background-color: #111;
         color: #fafafe;
     }
     h2 a {
         color: #fafafe;
     }
     a {
-        color: #aaf;
+        color: #99f;
     }
     h1,h2,h3,h4,h5,h6 {
         margin-top: 0;
-        color: #adbac7;
+        color: #f7da4a;
     }
 }