Hi, With this code, nothing happens. Why? What's the difference between style p.class1 and .class1 p (or p .class1 )? Thanks. .class1 p { color: green; font-size: 36px } This is text in h4-tag. This is text in p-tag This is text in p-tag with class1.

.class1 p Mean the paragraph (p tag) inside an element whose class name is class1 class = "class1" > I am child of class1 .class1 p { color:green; } Now did you get it?

Space in CSS represent the children . class1 p Means the P tag which is inside an element having class 'class1' .In your case, there is no such P tag which is inside the Class1 element (h4) so nothing will happen. I think you read somewhere that space is used to select descendent element , By descendent they mean all children of an element and When they say child (.class1>p) they mean immediate child only.