Step 1 - Adding an ID (you can add class instead of ID) to H1
<h1 ID="Firstheading">Mars Calling. Get Your Tickets Now!</h1>
The ID is Firstheading
Let's create CSS style instruction inside the header -
Notice that in case of ID, we are using # to identify it. In case of Class we are using dot.
There is a difference between ID and Class - https://www.w3schools.com/html/html_id.asp