main
{
  padding: 10px 20px; 
  max-width: 1800px;
  margin: 0 auto;
}

section img
{
  max-width: 100%;
  height: auto;
  display: block;
  margin-top: 10px;
}

iframe 
{
  display: block;
  margin-top: 10px;
  max-width: 100%;
  border-radius: 10px;
}