header {
 display: flex;
justify-content: center;
}



.image-ronded{
  width : 150px; height : 150px;
  border: none;
  -moz-border-radius : 75px;
  -webkit-border-radius : 75px;
  border-radius : 75px;
  filter: grayscale(1);
  -webkit-filter: grayscale(1);
  -moz-filter: grayscale(1);
  -o-filter: grayscale(1);
  -ms-filter: grayscale(1);
}

.image-ronded:hover {
  width : 150px; height : 150px;
  border: none;
  -moz-border-radius : 75px;
  -webkit-border-radius : 75px;
  border-radius : 75px;
filter: grayscale(0);
  -webkit-filter: grayscale(0);
  -moz-filter: grayscale(0);
  -o-filter: grayscale(0);
  -ms-filter: grayscale(0);
}

body {
            background-color:#BBB8B8;
           
        }

p {
 display: flex;
justify-content: center;
  margin: 70px;
}

#footer {
 display: flex;
justify-content: center;
margin-top: 150px
}
  


#conteneur
{
    display: flex;
justify-content: space-around;

  margin: 70px;
}