Misc mobile fixes (#83)

scss/mobile-stuff.scss

@@ -2,7 +2,7 @@
 @include breakpoint(medium) {
   html,
   .d-header {
-    background-color: var(--secondary);
+    background-color: var(--d-content-background);
   }
 }
 #main-outlet-wrapper {
@@ -89,7 +89,7 @@
 
   #topic-title {
     @include breakpoint(mobile-extra-large) {
-      padding-inline: var(--spacing-inline-m) !important;
+      padding-inline: var(--spacing-inline-s) !important;
 
       .title-wrapper {
         gap: var(--spacing-block-s);
@@ -119,6 +119,12 @@
           oklch(from var(--category-badge-color) 100% calc(c * 0.9) h)
         );
       }
+      .discourse-tags {
+        gap: var(--spacing-inline-xs);
+        &__tag-separator {
+          display: none;
+        }
+      }
       .discourse-tag {
         font-size: var(--font-down-2-rem);
         padding: var(--spacing-inline-xs) var(--spacing-inline-s);