add border top to the section

Author: josephaw1022

_sass/includes/homepage-dev-ui-band.scss

@@ -1,6 +1,7 @@
 .homepage-dev-ui-band {
   color: var(--main-text-color);
   padding: 4rem 2rem;
+  border-top: 1px solid var(--card-outline);
 
   h3 {
     font-size: 2.5rem;