.container_n
{
  background-image: url('/sites/oklk.wum.edu.pl//files/2024-04/dark-green-leaves.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: top center;
  background-attachment: fixed;
     
}
.tlo_b
{
  background-color: rgba(255, 255, 255, 0.8);
    max-width: 1000px;
    margin: auto;
    padding: 50px;
    
}