update markup styles

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

src/styles/markup.scss

@@ -12,13 +12,21 @@
   h3 {
     @apply text-xl font-black;
   }
+
+  hr {
+    @apply mb-4;
+
+    &:last-child {
+      @apply mb-0;
+    }
+  }
   
   p {
     @apply mb-4 whitespace-pre-wrap;
-  }
-  
-  p:last-child {
-    @apply mb-0;
+
+    &:last-child {
+      @apply mb-0;
+    }
   }
   
   a {