<|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 class to create a link which shows on hover.
<|im_end|>
<|im_start|>assistant
.show-on-hover {
  display: none;
  &:hover {
    display: block;
  }
}<|im_end|>
