diff --git a/Iceshrimp.Frontend/Core/Miscellaneous/RenderMfm.cs b/Iceshrimp.Frontend/Core/Miscellaneous/RenderMfm.cs
index 56e52680..fc6187c1 100644
--- a/Iceshrimp.Frontend/Core/Miscellaneous/RenderMfm.cs
+++ b/Iceshrimp.Frontend/Core/Miscellaneous/RenderMfm.cs
@@ -472,6 +472,8 @@ public static partial class MfmRenderer
 
 		if (args.TryGetValue("color", out var color) && ValidColor(color))
 			el.SetAttribute("style", $"display: inline-block; color: #{color};");
+		else
+			el.SetAttribute("style", $"display: inline-block; color: #f00;");
 
 		return el;
 	}
@@ -482,6 +484,8 @@ public static partial class MfmRenderer
 
 		if (args.TryGetValue("color", out var color) && ValidColor(color))
 			el.SetAttribute("style", $"display: inline-block; background-color: #{color};");
+		else
+			el.SetAttribute("style", $"display: inline-block; background-color: #f00;");
 
 		return el;
 	}