.box1{
    width: 100%;
    height: 700px;
    background-image:linear-gradient(rgba(0,0,0,0.4),rgba(0,0,0,0.4)), url("../images/dentist.jpeg");
    background-size: cover;
    background-position: bottom;
    background-attachment: fixed;
    border-radius:0 0 20px 20px;
    
  
  }