Improve component rendering styles

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

assets/sass/common.scss

@@ -13,7 +13,17 @@ a {
 }
 
 a:hover {
-  color: var(--text-700);
+  color: var(--text-800);
+}
+
+sup,
+sub {
+  color: var(--text-600);
+}
+
+sup:hover,
+sub:hover {
+  color: var(--text-800);
 }
 
 h1,
@@ -22,14 +32,25 @@ h3,
 h4,
 h5,
 h6 {
-  margin: 0;
   font-weight: 500;
 }
 
+hr {
+  margin: 1rem 0 1rem 0;
+  border: none;
+  height: 0.15rem;
+  background-color: color-mix(in srgb, var(--text) 30%, var(--background));
+}
+
 figure {
   margin: 0;
 }
 
+blockquote {
+  margin: 1rem 0 1rem 0;
+  padding: 0.5rem 1rem 0.5rem 1rem;
+}
+
 body {
   margin: 0.5rem;
   min-height: calc(100vh - 1rem);