What to know about CSS variables and themes in CSS
Variables centralize colors, spacing, and sizing so themes are easier to maintain across a project. This chapter explains the concept, demonstrates a practical example, and gives you a guided exercise.
How to use CSS variables and themes in CSS
Write a rule with a clear selector and declarations, then inspect the cascade in browser developer tools. Prefer reusable classes, responsive units, and visible focus styles.
Example: CSS variables and themes in CSS
Use this example as a starting point. Identify the part that controls the result, then adapt it to your own page or project.
:root { --primary: #2563eb; --space: 1rem; }
.card { background: var(--primary); }Common questions about CSS variables and themes
When should I use CSS variables and themes?
Use this technique when it expresses the structure, styling, or behavior your page needs. Keep the implementation focused and test it with the surrounding content.
What should I practice next?
Style a responsive card with readable type, consistent spacing, a clear focus state, and a layout that adapts to a narrow screen.
Practice CSS variables and themes
Style a responsive card with readable type, consistent spacing, a clear focus state, and a layout that adapts to a narrow screen. Compare your result with the example and check it at both desktop and mobile widths where relevant.
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