style.css

.content {
 max-width: 980px;
 margin: 0 auto; 
}

@media only screen and (max-width: 1068px) {
 .content {
  max-width: 698px; 
 }
}

@media only screen and (max-width: 735px) {
 .content {
   max-width: 90%;
 }
}