Thank you for sharing your dream with us. Please take everything that I share back to the Holy Spirit as He Alone gives the accurate interpretation.
Context is imperative in dream interpretation and colours can have both negative and positive meaning. In the context of your dream, the dream could be suggesting that there is an opportunity that you’ve been missing (people vying with you to get on the elevator) but you will get an opportunity in a “narrow” (think of it as a “slim” opportunity) and it might be a “humble” (brown)one. Humble in the sense that the opportunity might not be what you expected or you might get it because of your humility. God may have seen your struggles and will reward you with this opportunity.
I don’t think it is a bad dream at all, rather one of encouragement 🙂