what is the css code for this: Create an external style sheet named Sheet$4$style.css$.$ In this new file, add the CSS

rules as a following:

O Insert a comment section that contains your name and the sheet name $($Sheet

$.$

Apply styles to the body of the document: background$-$color, font$-$family,

max$-$width: $60\%$ and margin: auto.

$$ Set the font$-$weight to $700$ and the background$-$color to light blue for all

level $1$ headings.