Layout issue

[VictorABL-Out]

Hi,

I'm working on a projet, and and previous worker customized the trendmicro-bar with selectors as : .sidenav---sidenav-nav---3tvij > .sidenav---sidenav-navitem---uwIJ-:hover > .sidenav---navitem---9uL5T::after

and now i cannot display big element on this page, all elements goes below the sidenav bar, i cannot understand how to fix this issue.

here is the html code we use for :

<Router>
  <Route render={({ location, history }) => (
    <React.Fragment>
      <SideNav>
       
      </SideNav>
      <main className="main-container">

      </main>
    </React.Fragment>
  />
</Router>

I cannot understand if it a problem selectors or something else,

Thanks for your informations,

Best regards