title: show/hide div based on dropdown box selection
body: <p>I want to do show/hide div based on dropdown box selection.
  And display relevant content / text for each month as in the attached example.
  also need after the month passes the option to view the information about it will be automatically removed and so only the relevant content will be displayed.</p>
  <p>Can anyone help me with a suitable code please?</p>
  <p><a href="https://i.stack.imgur.com/DHi1L.png" rel="nofollow noreferrer">enter image description here</a></p>