diff --git a/CHANGELOG.md b/CHANGELOG.md
index 86d7058b1..6751a00ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Editor losing focus when project changes (#959)
 - Fix preview link (#912)
 - Web component code attribute (#963)
+- Fix substring match on CSS images (#910)
 - Error message wrapping (#968)
 - Fix scrollbars not showing (#816)
 - Width of empty `p5` canvas (#969)
diff --git a/src/components/Editor/Runners/HtmlRunner/HtmlRunner.jsx b/src/components/Editor/Runners/HtmlRunner/HtmlRunner.jsx
index efa6de540..b29a30454 100644
--- a/src/components/Editor/Runners/HtmlRunner/HtmlRunner.jsx
+++ b/src/components/Editor/Runners/HtmlRunner/HtmlRunner.jsx
@@ -114,9 +114,11 @@ function HtmlRunner() {
     var updatedProjectFile = { ...projectFile };
     if (projectFile.extension === "css") {
       projectImages.forEach((image) => {
+        const find = new RegExp(`['"]${image.filename}['"]`, "g"); // prevent substring matches
+        const replace = `"${image.url}"`;
         updatedProjectFile.content = updatedProjectFile.content.replaceAll(
-          image.filename,
-          image.url,
+          find,
+          replace,
         );
       });
     }