.question{
color:blue;
}


.bouton{
display:block;
width:150px;
line-height:50px;
text-align:center;
vertical-align:middle;
background:url(images/bouton-noir.png) no-repeat;
color:blue;
text-decoration:none;
background-color: green;
}


td {
font-family: sans-serif;
border: thin solid #6495ed;
width: 25%;
padding: 5px;
text-align: center;
background-color: #ffffff;
}



ul.navbar {
  list-style-type: none;
  padding: 0;
  margin: 0;
  position: absolute;
  top: 2em;
  left: 1em;
  width: 9em }
h1 {
  font-family: Helvetica, Geneva, Arial,
        SunSans-Regular, sans-serif }
ul.navbar li {
  background: white;
  margin: 0.5em 0;
  padding: 0.3em;
  border-right: 1em solid black }
ul.navbar a {
  text-decoration: none }
a:link {
  color: blue }
a:visited {
  color: purple }
address {
  margin-top: 1em;
  padding-top: 1em;
  border-top: thin dotted }