You can add background colour to ur html page by <body style="background-color: black;">
And u can add colour to <p> and <h> tags too. to do that add style attribute and then add color.
<h1 style="color : red">Hello</h1>
u can also add color in rgb format, here is the code snippet for that. You can get rgb codes using color picker websites.
<h1 style="color: rgb(10, 5, 240)">Hello</h1>
Put them all together
