section{padding:30px;}
.required:after{content: " *"; color: red;}

i.retour
{
cursor: pointer;

}

.button.visible
{
    
    visibility:visible;
    animation:anim 1s alternate 1;
}

  
.button.invisible
{
    visibility:hidden;
  
}

  
@keyframes anim {
    50% {
      -webkit-transform: scale(1.2);
      transform: scale(1.2);
    }
  }


  ul.selected
  {
    display: inline;
  }