title: Div / Class hides on Html page launch
body: <p>I am having a headache to understand what is wrong with my html page.</p>
  
  <p>I have got different Divs and Class that appear for one second (When I launch the page for the first time) then, they hide.</p>
  
  <p>But if i make a scroll or any move on the page, all the divs / class appear.</p>
  
  <p>Same happens with the footer ( But only on this page, other pages of the site are not impacted ) </p>
  
  <p>Here is a link to the page :  <a href="http://www.dentalbel.be/test/produits.html" rel="nofollow">http://www.dentalbel.be/test/produits.html</a></p>
  
  <p>If anyone could help me, i'd be grateful.</p>
  
  <p>Thank you</p>