Check out the improvements related to HTML, CSS in developer tools in Chrome browser version 74, you need to go through the tutorial to understand the changes done in chrome 74 related to Developer Tools
CSS stands for Cascading Style Sheet. CSS helps to give a design to HTML web page. It is used for giving a preferred layout to your HTML web page. Using CSS you can change the text color, background color of the web page, change the display layout, change the font style displayed on the web page. Versions of CSS Cascading Style Sheet 1,
Cascading Style Sheet 2, Cascading Style Sheet 3.