Organizing the External CSS (Cascading Style Sheets) files

If there is more than 1 CSS file, like this
style1.css
style2.css
..
styleX.css

CSS Syntax

selector {
property1: value1;
property2: value2;
..
propertyX: valueX;
}

Class in CSS

p.bodytext {color: black;}
p.alert {color: red;}

example in HTML using this CSS