corrections solution

src/convertToObject.js

@@ -9,7 +9,18 @@ function convertToObject(sourceString) {
   return sourceString
     .split(';')
     .filter((line) => line.trim())
-    .map((line) => line.split(/:(.+)/).map((part) => part.trim()))
+    .map((line) => {
+      const colonIndex = line.indexOf(':');
+
+      if (colonIndex === -1) {
+        return [null, null];
+      }
+
+      const key = line.slice(0, colonIndex).trim();
+      const value = line.slice(colonIndex + 1).trim();
+
+      return [key, value];
+    })
     .reduce((styles, [key, value]) => {
       if (key && value) {
         styles[key] = value;