diff --git a/Mjml.Net/Components/Body/HeroComponent.cs b/Mjml.Net/Components/Body/HeroComponent.cs
index d02b51d..0eef2fb 100644
--- a/Mjml.Net/Components/Body/HeroComponent.cs
+++ b/Mjml.Net/Components/Body/HeroComponent.cs
@@ -165,7 +165,7 @@ static void MagicId(IHtmlRenderer renderer, double backgroundRatio)
             {
                 renderer.StartElement("td") // Style td-fluid
                     .Style("mso-padding-bottom-alt", "0")
-                    .Style("padding-bottom", $"{backgroundRatio}px")
+                    .Style("padding-bottom", $"{backgroundRatio}%")
                     .Style("width", "0.01%");
                 renderer.EndElement("td");
             }