Cascading Style Sheets (CSS) is a web development language that controls the appearance of elements on a webpage. It works hand-in-hand with markup languages like HTML (Hypertext Markup Language) or XML (Extensible Markup Language) to define the visual style and formatting of those elements.
CSS separates the underlying code from its presentation, allowing web developers to control a website's visual style — such as its fonts, colors, and layout, and create responsive design variations to adapt to different devices and screen sizes — without altering its content.
For example, CSS allows you to specify that all paragraphs in a flexbox should be in a 12-point font size, in blue, and with a 10px left margin. You can apply this command to all sections or a specific body of text — all while making minor tweaks to the code.
