.bloc {
  margin: 5%;
  text-align: center;
  padding: 0 15% 5%;
  box-shadow: -15px 15px 35px rgba(50,50,93,.4), 15px 5px 15px rgba(0,0,0,.07);
  border-radius: 5px;
  background: #F3F3F6;
}
    .bloc h1 {
        text-transform: uppercase;
        padding-top: 5%;
        margin-bottom: 5%;
    }

#liens {
  margin-top: 10%;
  display: flex;
  justify-content:space-around;
}
  #liens img {
    -webkit-filter: blur(1px) grayscale(100%);
  }
  #liens img:hover {
    -webkit-filter: blur(0);
  }