.bloc_haut
{
  position: relative;
  overflow: hidden;
  width: 480px;
  height: 230px;
  background-image: url('http://puu.sh/8EFvx.png');
  font-family: Patrick Hand SC;
  font-size: 24px;
  text-align: center;
  padding: 10px;
  border: 1px solid #000;
}

.bloc_haut_volet
{
  width: 500px;
  height: 250px;
  position: absolute;
  top: O;
  left: 0;
  transition: all 1s linear;
  border: 1px solid #000;
  background-position: center center;
}

.petit_bloc
{
  width: 32px;
  height: 250px;
  background: #FFF;
  opacity: 0.8;
  float: right;
  text-align: center;
  font-family: Patrick Hand SC;
  font-size: 28px;
  padding-top: 10px;
  
}

.bloc_haut:hover > .bloc_haut_volet 
{
  left: -470px;
}

.bloc_texte_volet
{
  width: 440px;
  margin-left: 35px;
  height: 200px;
  text-align: justify;
  font-family: Times New Roman;
  font-size: 11px;
  overflow: hidden;
}

.bloc_texte_volet:hover
{
  width: 440px;
  margin-left: 35px;
  height: 200px;
  text-align: justify;
  font-family: Times New Roman;
  font-size: 11px;
  overflow: auto;
}