165. Triangle Shapes

Create triangle shapes using CSS border techniques.

⚠️ Do not modify the React component. Only update styles.css.

Requirements

• Render four triangles: up, down, left, and right
• All triangles should have the same size
• All triangles should use the same color
• Layout should stay clean and readable

Goal

Use border-based CSS triangles with width: 0 and height: 0.