.container_n
{
  background-image: url('/sites/zakladrehabilitacji.wum.edu.pl/files/2024-03/r4.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: 900px;
    margin: auto;
    padding: 50px; 
}