WordPress is a mixture of backend programming and front-end web designing principles that together contribute to the website's appearance and functionality. CSS is a brilliant style sheet language that takes care of the visual appearance of your website and handles the formatting of the relative HTML files. However, the unused Cascading Style Sheets (CSS) file in your WordPress website can create certain issues for your website performance at times. When applied, the CSS code loads on your web pages every time the users open it, even if there's no use of it. Hence, you need to remove unused CSS in WordPress or any other sort of website you're running. Read more on https://bit.ly/3lKZwPW