Change hints for missing remote content in web UI (#31516)

app/javascript/styles/mastodon/components.scss

@@ -4217,11 +4217,12 @@ a.status-card {
 
 .timeline-hint {
   text-align: center;
-  color: $darker-text-color;
-  padding: 15px;
+  color: $dark-text-color;
+  padding: 16px;
   box-sizing: border-box;
   width: 100%;
-  cursor: default;
+  font-size: 14px;
+  line-height: 21px;
 
   strong {
     font-weight: 500;
@@ -4238,10 +4239,10 @@ a.status-card {
       color: lighten($highlight-text-color, 4%);
     }
   }
-}
 
-.timeline-hint--with-descendants {
-  border-top: 1px solid var(--background-border-color);
+  &--with-descendants {
+    border-top: 1px solid var(--background-border-color);
+  }
 }
 
 .regeneration-indicator {