Sample heading
Lorem ipsum dolor sit amet consectetur adipisicing elit. Sed aliquid, distinctio ipsa pariatur exercitationem voluptate illo accusamus in sint voluptas quia alias odit! Nesciunt expedita libero accusantium sed quibusdam magni!
Lorem ipsum dolor sit, amet consectetur adipisicing elit. Exercitationem nisi modi cum inventore doloremque, obcaecati, odit eligendi dolorum repellat quis similique quam iusto soluta explicabo beatae a neque saepe ratione?
Exercise 12.1: Create an event listener with an external function to change the box background color to red
btn_1, when clicked, should change the background color of box-color-1 to red.
Exercise 12.2: Create an event listener with an internal function
btn_2, when clicked, should change the background color of box-color-2 to green.