We can use variables in css. CSS Variables are entities defined by authors, or users, of Web pages to contain specific values throughout a document. They are set using custom properties and are accessed using a specific functional notation var(). syntax :root { --variable_name_1:value_1; --variable_name_2:value_2; .... .... .... --variable_name_n:value_n; } Example :root { --clr:red; --mrgn:50px; } div { background:var(--clr); margin-top:var(--mrgn); } Problems to solve When building large sites, authors often face a maintainability challenge. In s...