.monospace {
    font-family: monospace;
}

.source-code {
    height: 250px;
    overflow: scroll;
    white-space: pre;   /* keep this line to support earlier browsers */
    white-space: pre-wrap;
}

.monospace {
    font-family: monospace;
    white-space: pre;   /* keep this line to support earlier browsers */
    white-space: pre-wrap;
}

.source-code {
    height: 250px;
    overflow: scroll;
}

Move output CSS into monospace class.
Move output CSS into monospace class.
