div.dbug {
    background-color: #fff;
    border: 1px solid #f00;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .5);
    color: #333;
    font-size: 1em;
    line-height: 1.2;
    margin: 1em;
    padding: 1em;
    text-align: left;
}

div.dbug .backtrace {
    color: #666;
    font-size: .8em;
}