body{

    font-family:Arial;

    padding:40px;

}

.container{

    width:600px;

}

.row{

    display:flex;

    gap:10px;

}

input{

    flex:1;

    padding:10px;

    font-size:18px;

}

button{

    padding:10px 20px;

    font-size:18px;

    cursor:pointer;

}

#message{

    margin-top:20px;

    color:green;

}