update custom CSS

Author: nicolethoen

src/app/app.css

@@ -2,6 +2,8 @@ html, body, #root {
   height: 100%;
 }
 
-.pf-c-content small {
-  --pf-c-content--small--Color: red;
+.pf-c-content {
+  --pf-c-content--small--Color: red; /* changes all <small> color to red */
+  --pf-c-content--blockquote--BorderLeftColor: purple; /* changes all <blockquote> left border color to purple */
+  --pf-c-content--hr--BackgroundColor: lemonchiffon; /* changes a <hr> color to lemonchiffon */
 }