title: Calendar is partially hidden from <header> tag
body: <p>I'm trying to show fullcalendar on his full height,
  it is an item of  tag as container, but if I set height 100% is reimain hidden. 
  Sorry but I can't understard what is wrong.</p>
  
  <p><a href="https://postimg.cc/5Y6jFWYw" rel="nofollow noreferrer"><img src="https://i.postimg.cc/LXVPwHm0/2019-06-22-09h54-15.png" alt="2019-06-22-09h54-15.png"></a></p>