@media (max-width: 980px) {
     section.about-us .about-image-sec img {
    height: 300px;
}
  
  .about-image-sec {
    width: 100%;
    float: right;
    margin-left: 50px;
    margin-bottom: 20px;
}
  
  section.about-us{
    padding-top:0;
  }
  
}