diff --git a/challenges/01-front-end-development-certification/html5-and-css.json b/challenges/01-front-end-development-certification/html5-and-css.json
index 3b010e2c25..46217e6abe 100644
--- a/challenges/01-front-end-development-certification/html5-and-css.json
+++ b/challenges/01-front-end-development-certification/html5-and-css.json
@@ -733,8 +733,8 @@
         "assert($(\"p\").length > 1, 'message: You need 2 <code>p</code> elements with Kitty Ipsum text.');",
         "assert(code.match(/<\\/p>/g) && code.match(/<\\/p>/g).length === code.match(/<p/g).length, 'message: Make sure each of your <code>p</code> elements has a closing tag.');",
         "assert.isTrue((/Purr\\s+jump\\s+eat/gi).test($(\"p\").text()), 'message: Your <code>p</code> element should contain the first few words of the provided additional <code>kitty ipsum text</code>.');",
-        "assert(code.match(/<p>Purr jump eat the grass/), 'message: Do not add a class attribute to the second <code>p</code> element.');",
-        "assert(code.match(/<style>[\\w\\W\\s]*?p\\s*?{\\W*?font-size:\\s?16px;\\W*?}\\W*?<\\\/style>/), 'message: Between the <code>style</code> tags, give the <code>p</code> elements <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.');"
+        "assert($(\"p:not([class])\").length === 1, 'message: Do not add a class attribute to the second <code>p</code> element.');",
+        "assert(parseInt($(\"p:not([class])\").css(\"font-size\"), 10) > 15, 'message: Between the <code>style</code> tags, give the <code>p</code> elements <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.');"
       ],
       "type": "waypoint",
       "titleEs": "Cambia el tamaño de fuente de un elemento.",