diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-001.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-001.md
index b56b9656ea..8669316c4f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-001.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-001.md
@@ -46,7 +46,7 @@ assert(code.match(/<html\s*>/gi));
 Your `html` element should have a closing tag.
 
 ```js
-assert(code.match(/<\/html\s*>/));
+assert(code.match(/<\/html\s*>/gi));
 ```
 
 Your `html` element should be below the `DOCTYPE` declaration.
diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-007.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-007.md
index 65e2bd7dc4..c82ce980a8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-007.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-007.md
@@ -16,7 +16,7 @@ Nest a `link` element within the `head`. Give it a `rel` attribute set to `style
 Your code should have one `link` element.
 
 ```js
-assert(code.match(/<link/g)?.length === 1);
+assert(code.match(/<link/i)?.length === 1);
 ```
 
 Your `link` element should be a self-closing element.
@@ -29,7 +29,7 @@ Your `link` element should be within your `head` element.
 
 ```js
 const head = code.match(/<head>(.|\r|\n)*<\/head>/i)?.[0];
-assert(head.match(/<link/g)?.length === 1)
+assert(head.match(/<link/i)?.length === 1)
 ```
 
 Your `link` element should have a `rel` attribute with the value `stylesheet`.
@@ -44,7 +44,7 @@ Your `link` element should have a `type` attribute with the value `text/css`.
 assert(code.match(/<link[\s\S]*?type=('|"|`)text\/css\1/gi)?.length === 1);
 ```
 
-Your `link` element should have an `href` attribute with the value `styles.css`.
+Your `link` element should have an `href` attribute with the value `styles.css`. Remember, casing matters when you link to an external file.
 
 ```js
 assert.match(code, /<link[\s\S]*?href=('|"|`)(\.\/)?styles\.css\1/);
diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-050.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-050.md
index ec64d22344..2df43026e7 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-050.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-050.md
@@ -25,7 +25,7 @@ Your `.red` CSS rule should have a `background` property with the value `linear-
 
 ```js
 assert(
-  __helpers.removeWhiteSpace($('style').text()).match(/\.red{.*background:linear-gradient\(90deg\).*}/g)
+  __helpers.removeWhiteSpace($('style').text()).match(/\.red{.*background:linear-gradient\(90deg\).*}/gi)
 );
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-051.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-051.md
index 5caf545ee2..3b01809ef5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-051.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-051.md
@@ -17,7 +17,7 @@ Your `.red` CSS rule should have a `background` property with the value `linear-
 
 ```js
 assert(
-  __helpers.removeWhiteSpace($('style').text()).match(/\.red{.*background:linear-gradient\(90deg,rgb\(255,0,0\)\).*}/g)
+  __helpers.removeWhiteSpace($('style').text()).match(/\.red{.*background:linear-gradient\(90deg,rgb\(255,0,0\)\).*}/gi)
 );
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-061.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-061.md
index 934bee85be..e0d3eb1a3a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-061.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-061.md
@@ -17,7 +17,7 @@ Your `.green` CSS rule should have a `background` property with the value `linea
 
 ```js
 assert(
-  __helpers.removeWhiteSpace($('style').text()).match(/\.green{.*background:linear-gradient\(180deg,#55680D\).*}/g)
+  __helpers.removeWhiteSpace($('style').text()).match(/\.green{.*background:linear-gradient\(180deg,#55680D\).*}/gi)
 );
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-067.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-067.md
index 7cecfc55e4..bc71769524 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-067.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-067.md
@@ -15,7 +15,7 @@ Your `.blue` CSS rule should have a `background` property with the value `linear
 
 ```js
 assert(
-  __helpers.removeWhiteSpace($('style').text()).match(/\.blue{.*linear-gradient\(hsl\(186,76%,16%\)\).*}/g)
+  __helpers.removeWhiteSpace($('style').text()).match(/\.blue{.*linear-gradient\(hsl\(186,76%,16%\)\).*}/gi)
 );
 ```
 
