Improve CSS layout spacing

_sass/_global.scss

@@ -10,12 +10,23 @@ h5,
 h6 {
   @include body-font;
   font-weight: 700;
+}
+
+h1 {
   margin-top: 3rem;
 }
 
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin-top: 4rem;
+}
+
 blockquote {
-  margin-left: 2rem;
-  margin-right: 2rem;
+  margin-top: 3rem;
+  margin-bottom: 3rem;
 
   padding-left: 1rem;
   padding-right: 1rem;