diff --git a/assets/css/theme.css b/assets/css/theme.css
index 235eb46..3f2d836 100644
--- a/assets/css/theme.css
+++ b/assets/css/theme.css
@@ -670,6 +670,11 @@ video {
   margin-bottom: 3rem;
 }
 
+.mx-4 {
+  margin-left: 1rem;
+  margin-right: 1rem;
+}
+
 .mb-4 {
   margin-bottom: 1rem;
 }