diff --git a/src/css/custom.css b/src/css/custom.css
index daabdbe71ba..7bff5bdfc88 100644
--- a/src/css/custom.css
+++ b/src/css/custom.css
@@ -145,4 +145,15 @@ a.navbar__item{
 
 a:hover.navbar__item{
   background-size: 0 3px, 100% 3px;
+}
+
+/* More prominent admonitions */
+.theme-admonition-danger {
+  border-left: 5px solid rgb(0, 0, 0);
+  background-color: rgba(255, 0, 0, 0.238);
+}
+
+.theme-admonition-info {
+  border-left: 5px solid rgb(0, 0, 0);
+  background-color: rgba(255, 255, 0, 0.238);
 }
\ No newline at end of file