body {
  background-image: url('https://s2.qwant.com/thumbr/474x312/7/1/e16bcd07b638cdee6ea57a5cc6f6f48dab1cb2461470a429306c48a3939f3d/th.jpg?u=https%3A%2F%2Ftse.mm.bing.net%2Fth%3Fid%3DOIP.glY8oOee9Lclz_43kgdnfwHaE4%26pid%3DApi&q=0&b=1&p=0&a=0');
  background-repeat: no-repeat;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-size: cover;
  display: flex;
  flex-direction: column;
  text-align: center;
  align-items: center;

}

.lien {
  background-color: #000000  ;
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  border-radius: 15px;
  display: flex;
  flex-direction: column ;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
   width: 20% ;
}

h1 {
color: #FFFFFF
}

h1 + p {
color: #FFFFFF
}

h2 {
color: #FFFFFF
}

h3 {
color: #FFFFFF
}


h4 {
color: #FFFFFF
}