Update README.md

Author: learning-zone

README.md

@@ -1517,7 +1517,7 @@ Relative length units specify a length relative to another length property. Rela
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-## Q. What is pseudo element? What is pseudo class?
+## Q. What is pseudo element and pseudo class?
 
 **1. Pseudo Element**: A CSS pseudo-element is used to style specified parts of an element.