@media (max-width:449px){
    body{
        padding-bottom: 50px;
    }
    #backToTop{
      margin-bottom: 60px;
    }
}

@media (max-width: 640px) {
    .second-img-hidden {
      display: none;
    }
  }

 
  @media(min-width:900px){
    .carousel-item{
      height: 220px;
      width: 220px;
    }
  }