Demo
Summary
To select a descendant of an HTML element, use 2 selectors separated by a space (the first selector represents the parent element and the second selector represents the descendant):
.my-class p {
}
Details
The descendant combinator selects all descendants that match the selector, not just immediate children.
Exercises
Recreate the CSS code from the Demo section in your CSS file.
References
Descendant combinator on MDN