diff --git a/src/utils/quickCss.ts b/src/utils/quickCss.ts
index 000a13cd1..1cf2c643a 100644
--- a/src/utils/quickCss.ts
+++ b/src/utils/quickCss.ts
@@ -78,7 +78,7 @@ async function initThemes() {
                 normalizedValue = `${normalizedValue}${meta.units ?? ""}`;
             }
 
-            cssVars.push(`--${id}: ${normalizedValue};`);
+            cssVars.push(`--${id}:${normalizedValue};`);
         }
     }