note styling fixes

src/routes/(blank)/note/[slug]/+page.svelte

···
   :global(blockquote) {
     background: rgba(40, 40, 40, 0.5);
     margin: 1rem 0;
-    padding: 0.75rem 1rem;
+    padding: 0.1rem 1rem;
     border-left: 3px solid #555;
-    font-style: italic;
     position: relative;
   }
 
···
   }
 
   :global(p) {
-    margin: 0 0 1rem 0;
+    margin-block: 0.5lh;
   }
 
   :global(code) {
···
   :global(img) {
     max-width: 100%;
     max-height: 24em;
-    padding: 1rem auto;
     display: block;
     border-radius: 3px;
   }