body {
 
  background-color: azure;
  color: cobalt;
}  

p {
   width: 680px;
   padding-right:5cm;
   font-size: 1.2em;
   font-family: "Times New Roman"; 
}


img.dom {
    margin-top: 10px;
    margin-bottom: 20px;
    width: 680px;
    height: 500px;
}

img.center { 
    display: block;
    margin-left: auto;
    margin-right: auto; 
    margin-top: 10px;
    margin-bottom: 20px;
}


img.duo {
    margin-top: 10px;
    margin-bottom: 20px;
    width: 310px;
    height: 400px;
}