<|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 style to give a border of 3 pixels to the HTML element.
<|im_end|>
<|im_start|>assistant
html {
    border: 3px solid black;
}<|im_end|>
