Cascading Style Sheets, commonly known as CSS, serve as a style sheet language that web developers employ to organize the structure of HTML and other components within a website. Renowned for its prevalence, CSS ranks among the most widely utilized languages across the Internet. It is crucial for style sheets to function effectively that your markup remains free of mistakes. To conveniently rectify markup errors, utilizing a tool like HTML Tidy can be beneficial. This utility not only cleans up the markup but also enhances its readability and ease of editing. I highly suggest that you frequently apply Tidy to any markup you are working on, as it proves to be highly effective in refining content generated by authoring tools that might have inconsistent practices. Each style property is initiated by the property's name, followed by a colon, and then the designated value for that property. When listing multiple style properties, it’s necessary to separate each one with a semicolon to clearly distinguish one from another. In essence, adopting best practices with tools like Tidy can significantly streamline the process of web development and improve overall code quality.