There is no ONE CSS to rule them all.
Most books make use of '
class= ' in the HTML tags, That is usually the last one that applies . remember one of the C's is Cascade.
That can mean they can stack on a prior styling.
p {sets the overall style}
.indent {text-indent: 1.5em;} adds an indent to the basic P
Put your cursor on the style= part of the tag: ctrl+Right-mouse click to jump to that selection in the CSS