diff --git a/public/css/theme-red.css b/public/css/theme-red.css
index 9660c4f..54f3320 100644
--- a/public/css/theme-red.css
+++ b/public/css/theme-red.css
@@ -78,6 +78,6 @@ span.green .svg {
 
 details {
     background-color: var(--color-secondary-light-2); /* make collapsible elements easier to distinguish from main body */
-	border-radius: 4px; /* same as code blocks */
-	padding: .2em .4em; /* same as code blocks */
+    border-radius: 4px; /* same as code blocks */
+    padding: .2em .4em; /* same as code blocks */
 }
\ No newline at end of file