diff --git a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-013.md b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-013.md
index f629edfe7d..e9be78a9b3 100644
--- a/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-013.md
+++ b/curriculum/challenges/english/01-responsive-web-design/learn-css-colors-by-building-a-color-markers-set/step-013.md
@@ -7,7 +7,7 @@ dashedName: step-13
 
 # --description--
 
-Your marker would look better if it's centered on the page. An easy way to do that is with the `margin` <dfn>shorthand property</dfn>.
+Your marker would look better if it was centered on the page. An easy way to do that is with the `margin` <dfn>shorthand property</dfn>.
 
 In the last project, you set the margin area of elements separately with properties like `margin-top` and `margin-left`. The `margin` shorthand property makes it easy to set multiple margin areas at the same time.