The website displays brief information about planets. Improve its appearance by applying the following styles:
- Select all elements with the **text** class name and set the text color to **brown**.
- Select all elements with the **sub-text** class name and set the text color to **gray**.
- Add a hover effect to all elements with the **heading** class name. Change the text color to **darkblue** when hovered.

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- Use `.` to select elements by class name.
- Use `:hover` to apply styles when hovering.

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Master the essentials of CSS, the styling language that transforms the look and feel of web pages. Explore core concepts such as text styles, colors, spacing, the box model, Flexbox, and decorative effects. Build the skills to create visually engaging and well-structured web pages.

Understand how CSS connects to HTML and how styles are applied through selectors. Apply colors, text styling, and hover effects to control visual presentation.

Improve typography using line height, spacing, font properties, and custom fonts. Control font families, weight, style, and size for better readability.

Control layout structure using margin, padding, borders, and width properties. Understand box sizing behavior and element display types such as block, inline, and inline-block.

Control horizontal and vertical layouts using Flexbox properties. Adjust direction, alignment, and spacing to structure UI components.

Enhance layouts using background colors, images, pseudo-elements, and shadows. Style visual components for depth and contrast.

Challenge: Style Your First Web Page