#under-construction{ padding:150px 0; text-align:center; }
#under-construction h1{ font-size:80px; }

@media (max-width: 1024px){ 
   #under-construction{ padding:300px 0; }
   #under-construction h1{ font-size:60px }
}

@media (max-width: 767px){ 
   #under-construction{ padding:100px 0; }
   #under-construction h1{ font-size:40px; }
}