html, body{
    height: 100%;
    width: 100%;
 
}
@media (max-width: 767px) {
    .display-4 {
        font-size: 2rem;
        font-weight: 500;
        line-height: 1.5;
        text-emphasis-color: crimson;
    }
  }
  
  @media (max-width: 900px) {
    .display-4 {
        font-size: 2rem;
        font-weight: 500;
        line-height: 1.5;
        text-emphasis-color: crimson;
        
    }
  }