What is CSS?
CSS is responsible for webpage layout. Without CSS, a webpage looks like just a bunch of disordered HTML elements.
CSS: stands for Cascading Style Sheets describes how HTML elements are to be displayed on the screen, paper, or in other media saves a lot of work. It can control the layout of multiple web pages all at once CSS files store external stylesheets
How Can I Add Custom CSS Codes or Classes?
Popo Themes gives you the ability to assign CSS codes for the whole website, Responsive view, Admin area. Also, you can add new classes <body> to tag. For this purpose go to Dev → Theme Options → Custom CSS & JS.
1- Custom CSS: Paste your CSS code, do not include any tags or HTML in this field. Any custom CSS entered here overrides the theme CSS. In some cases, the tag
!important may be needed.