@media(max-width:767px){
  .heading_description h1{
    font-size: 20px !important;
}
  
@media(min-width:768px){
   .heading_description h1{
    font-size: 24px !important;
}
  
@media(min-width:992px){
   .heading_description h1{
    font-size: 36px !important;
}