header { display:inline-block;}
body {
  margin: 2vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100%;
  height: 96vh;
  font-size:2em;
}
.hide { display:none;}
#cookie { background-color:red;padding:10pt;}
#intro { background-color:yellow;padding:10pt;}
#OK { background-color:green;}
#NOK { background-color:red;}
a { text-decoration:none;}