title: How to adjust the size of matplotlib legend box
body: <p>I have a graph whose left upper corner is quite blank. So I decide to put my legend box there. </p>
  
  <p>However, I find the <strong>items in legend</strong> are very small and the <strong>legend box itself</strong> is also <strong>quite small</strong>.</p>
  
  <p>By "small", I mean something like this</p>
  
  <p><img src="https://i.stack.imgur.com/ylMMM.png" alt="enter image description here"></p>
  
  <p><strong>How can I make the items (<em>not texts!</em>) in the legend box bigger?</strong></p>
  
  <p><strong>How can i make the box itself bigger?</strong></p>