You can optionally use CSS to change the appearance of the containing element, such as height, width, border, margins, etc.
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WordPress plugin and theme development are big businesses and you can also create and sell themes and plugins. What you should learn first, where to find good resources to learn web design and development. Web design and development is a vast topic and I think it is difficult to learn all the languages. There are so many programming and scripting languages. There are different languages for front-end developers and back-end developers.