.erreur 
{
  background-color: #ff1616;
  color: white;
  padding: 0 1ex 0 1ex;
  margin: 1em 1ex 1em 1ex;
  border: 1px solid black;
  font-weight: bold;
  text-align: left;
}
.erreur em 
{ 
  color: yellow;
  font-style: normal;
  font-size: 110%;
}
.erreur em em
{ 
  font-style: italic;
  color: #404040;
  font-size: 100%;
}
.avertissement 
{
  background-color: #ff1616;
  color: white;
  font-weight: bold;
  padding: 0 1ex 0 1ex;
  margin-top: 1em;
  margin-bottom: 1em;
  border: 1px dotted gray;
}
.avertissement em 
{  
  color: #808080;
  font-style: italic;
}
.message 
{
  font-weight: normal;
  border: thin solid black;
  background-color: #aaffac; 
  text-align: center;
  color: black;
  padding: 0 1ex 0 1ex;
  margin: 1em auto 1em auto;
  width: 90%;
  }