html {
    background: #FFFFFF;
    -webkit-font-smoothing: antialiased;
}

body {
    background: #FFFFFF;
    box-shadow: 0 0 2px rgba(0, 0, 0, 0.06);
    color: #545454;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    margin: 0 auto;
    max-width: 800px;
    padding: 2em 2em 4em;
}
.footer {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1rem;
  background-color: #efefef;
  text-align: center;
}

.conteneur{
  width: 300px;
  height: 300px;
  border: 1px #aaa solid;
  text-align: center;
  display: table-cell;
  vertical-align: middle;
}

a:link {
    color: black;
}
img {
    position: absolute;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

@-webkit-keyframes colorize {
    0% {
        -webkit-filter: grayscale(100%);
    }
    100% {
        -webkit-filter: grayscale(0%);
    }
}

@keyframes colorize {
    0% {
        filter: grayscale(100%);
    }
    100% {
        filter: grayscale(0%);
    }
}