body {
   margin: 0;
   padding: 0;
   display: flex;
   flex-direction: column;
   align-items: center;
   background-color: white;
   height: 100vh; 
   overflow: hidden; 
}

#chatbox {
    width: 90%;
    height: 800px;
    border: 1px solid #ccc;
    overflow-y: scroll;
    background-color: lightskyblue;
    font-size: 0.8em;
}

#message {
    border: 1px solid #ccc;
}

.htmlaga {
   width: 100%;
   height: 100%;
   margin-left: 0px;
}

#usernamec {
    width: calc(100% - 22px);
    margin-bottom: 5px;
    border: 1px solid #ccc;
    border-radius: 50px;
    font-size: 1.2em;
}

#usernamec {
    font-size: 1em;
    border-radius: 50px;
}

/* Estilos para pantallas más pequeñas */
@media (max-width: 500px) {
   #chatbox {
      margin-left: 2px;
      width: 97%;
      height: 68%;
   }

   #titulo {
      margin-top: 0px;
      margin-bottom: 1px;
      font-size: 0.7em;
      color: red;
   }

   #chatform #chatform2 {
      margin-bottom: 0px;
      font-size: 3em;
   } 

   #message, #usernamec {
      width: 179px;
      margin-left: -7px;
      margin-top: 2px;
      margin-bottom: 2px;
      font-size: 1em;
      border-radius: 50px;
   }

   button {
      width: 185px;
      margin-left: -7px;
      padding: 0px;
      flex-shrink: 0;
      font-size: 1em;
   }

}

/* Media Query para pantallas grandes */
@media (min-width: 501px) {
   #chatbox {
      width: 90%;
      height: 60%;
   }

   #titulo {
      margin-bottom: 10px;
      font-size: 2em;
      color: blue;
   }

   #chatform, #chatform2 {
      margin-bottom: 10px;
      flex-direction: column;
      font-size: 3em;
   }

   #message, #usernamec {
      flex: 1;
      margin-right: 10px;
   }

   button {
      padding: 10px;
      flex-shrink: 0;
      font-size: 1.2em;
   }
}