title: How to style with css the <Tooltip> of Recharts lib
body: <p>I'm trying to customize the Recharts Tooltip, but even reading the documentation, I can't apply css.
  Below is the current and how I want to style.</p>
  
  <p><strong>Now</strong>:<br>
  <img src="https://i.stack.imgur.com/PZ3AJ.png" alt="Now"></p>
  
  <p><strong>Objective</strong>:<br>
  <img src="https://i.stack.imgur.com/7MM2E.png" alt="Objective"></p>