body {
  background: -moz-linear-gradient(top, cyan, blue);
  background: -webkit-linear-gradient(top, cyan, blue);
  background: -o-linear-gradient(top, cyan, blue);
  background: linear-gradient(top, cyan, blue);

  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;

  font-family: "Franklin Gothic Medium";
}

.header {
  position: relative;
  width: 90%;
  height: 70px;


  margin: auto;
  margin-top: 4px;

  border: 12px ridge #00ffff;
  border-radius: 10px;
  border-top: none;

}

.titre_tchat{
  position: relative;
  width: 350px;
  height: 70px;
  margin: auto;

  display: flex; /* Utiliser le modèle de boîte flexible */
  justify-content: center; /* Centrer horizontalement */
  align-items: center; /* Centrer verticalement */
  text-align: center; /* Centrer le texte horizontalement */

  font-size: 35px; /* Définir la taille du texte */
  color: white;
  font-weight: bold; /* Rendre le texte en gras */
  text-decoration: none; /* Supprimer la décoration de lien par défaut */

  text-shadow: -1.3px -1.3px 0 black, 1.3px -1.3px 0 black, -1.3px 1.3px 0 black,
    1.3px 1.3px 0 black;
}

.controlepanel {
  display: block;
  margin: auto;
  float: left;
  position: absolute;

  margin-top: 25%;
  margin-left: 25%;
}
.input-user {
  margin: auto;

  padding: 10px 30px;

  font-size: 16px;
  border: solid 2px #c9c9c9;
  width: 300px;

  text-align: center;
}
.btn-user {
  margin: auto;
  position: absolute;

  padding: 10px 30px;

  width: 200px;
  margin-left: 5px;

  font-size: 16px;
  background-color: #637aad;

  border: 2px solid #314179;
  color: #ffffff;
}
.btn-user:hover{
  font-size: 18px;
}

#result {
  margin: auto;
  margin-top: 25px;
  width: 450px;
  padding: 10px;
  background: #f1f3f4;
  height: 600px;
  overflow-y: auto;

  border: 8px ridge #00ffff;
  border-radius: 10px;

  font-family: "Open Sans", sans-serif, arial;
  font-size: 15px;
  color: #555;
}

#msgbox {
  margin-top: 25px;
  width: 350px;
  height: 70px;
 
  font-size: 16px;
  text-align: center;

  border: 5px ridge #00ffff;
  border-radius: 10px;
}
.btn-send {
  width: 120px;
  height: 55px;
  margin-left: 10px;

  font-size: 18px;
  background-color: #637aad;

  border: 2px solid #314179;
  color: #ffffff;
}
.btn-send:hover{
  font-size: 20px;
}

.tchatbody {  
  width: 600px;
  height: 70px;

  position: relative;
  margin: auto;

  display: flex; /* Utiliser le modèle de boîte flexible */
  justify-content: center; /* Centrer horizontalement */
  align-items: center; /* Centrer verticalement */
  text-align: center; /* Centrer le texte horizontalement */
}