body { 
  width: 700px; 
  margin: 50px;
}

input { margin: 10px 5px; width: 300px;}

/*input:focus { outline: none; }
input:focus:invalid { border: solid red; }
input:focus:valid { border: solid green; }*/

fieldset { 
  border: none; 
  padding: 10px 0; 
}

#article {
  padding: 5% 0 1%;
}