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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Style web pages using CSS to control layout, spacing, colors, and typography. Work with selectors, the box model, and Flexbox to build structured layouts. Create modern UI components using backgrounds, fonts, and visual effects.

Challenge: Style Your First Web Page