body{
  margin-right:10%;
  background-color:lightgrey;
}

.conteneur{
  justify-content:center;
  display:flex;
  align-items:stretch;
}

.contenu{
  background-color:yellow;
  flex:0 1 200px;
}
.contenu0{
  background-color:yellow;
  flex:0 1 200px;
  animation: anim-beug 1.5s infinite;
}
.contenu1{
  background-color:green;
  padding: 50px;
  flex:0 1 200px;
  animation: anim-beug 1s infinite;
}

@keyframes anim-beug {
0% {color:red}
100% {color: yellow}
}

.contenu3{
  background-color:yellow;
  padding-top: 80px;
  animation: anim-beug 1s infinite;
}

.contenu4{
  background-color:yellow;
  padding-top: 80px;
  padding-right: 190px;
  animation: anim-beug 2.5s infinite;
}

.contenu5{
  background-color:ligne;
  padding-top: 100px;
  margin-left: 740px;
}

a:hover{
color: #FFFB00;
}