Add beta message gap

Author: hojberg

src/css/unison-share/page/project-contribution-changes-page.css

@@ -14,6 +14,10 @@
 }
 
 .project-contribution-changes-page {
+  display: flex;
+  flex-direction: column;
+  gap: 1.5rem;
+
   & .branch-diff-content {
     display: flex;
     flex-direction: column;