<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write a CSS rule that changes the text color for all headings on a page.
<|im_end|>
<|im_start|>assistant
h1, h2, h3, h4, h5, h6 {
   color: red;
}<|im_end|>
