.encadre {
  background-color: lightgrey;
  width: auto;
  height: 150px;
  border: 4px solid green;
  padding: 50px;
  margin: 20px 0 0 0;
}
    
    body {font-family:Arial}
    body {text-align: justify;}
    p {font-weight:400;}

    h1 {color:white;}
    h1 {background-color:forestgreen;}
    h2 {color:white;}
    h2 {background-color: teal;}
    h3 {color:black;}
    h3 {background-color: lightseagreen;}
    h4 {color:black;}
    h4 {background-color:darkseagreen;}

h1, h2, h3, h4 {text-align: center;}
    
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {

}

li a {
      float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #4CAF50;
}