body {
    background-color:#ccc;
}

#message {
    position:           absolute;
    top:                50%;
    left:               50%;
    margin-top:         -10em;
    width:              50em;
    height:             20em;
    margin-left:        -25em;
    border:             2px ridge #a22;
    background-color:   #fff;
    padding:            .5em 1em;
}
#message h2 {
    text-align:         center;
}
#message .err {
    font-weight:        bold;
}

#backtrace {
    position:           absolute;
    bottom:             0;
    left:               0;
    border-top:         2px ridge #a22;
    padding:            .5em 1em;
    font-size:          80%;
    background-color:   #fdd;
}
#backtrace textarea {
    width:              100%;
    height:             8em;
    background-color:   #fee;
}