#en {
    display: none;
  }
  
  .button_lang {
    background-color: #444;
    color: #FFF;
    padding: 8px 20px;
    border-radius: 5px;
      
    -webkit-transition: background-color .3s ease-in-out;
    -moz-transition: background-color .3s ease-in-out;
    -o-transition: background-color .3s ease-in-out;
    -ms-transition: background-color .3s ease-in-out;
    transition: background-color .3s ease-in-out;
  }
  .button_lang:hover, .current_lang {
    background-color: #777;   
    -webkit-transition: background-color .3s ease-in-out;
    -moz-transition: background-color .3s ease-in-out;
    -o-transition: background-color .3s ease-in-out;
    -ms-transition: background-color .3s ease-in-out;
    transition: background-color .3s ease-in-out;
  }
  ul li {
    width: auto;
    display: inline;
  }