.centre{
    width: 50%;
    margin-left: auto;
    margin-right: auto;
    display: block;
    border: 1px solid black;
    border-radius: 5px;
    padding: 10px;
    background-color: whitesmoke;
}
body{
    background-color: cornflowerblue;
}
*{
    font-family: monospace;
}
textarea{
    width: 50%;
}