* { box-sizing: border-box; }
img, table, iframe, video { max-width: 100%; height: auto; }
@media (max-width: 768px) {
  body { overflow-x: hidden; }
  div, section, article { max-width: 100% !important; }
  table { width: 100% !important; overflow-x: auto; display: block; }
  input, select, textarea, button { max-width: 100%; }
}