I don't know much about that wallet but generally web wallets will charge a fixed fee in bitcoin regardless of the transaction amount (as others have said). If you are more patient to wait more than 1 blocks worth you should choose a wallet that lets you set the fee, then you can set it low (check https://bitcoinfees.earn.com/). You can set much more appropriate fees, but the drawback is you will have to wait a long time for the transaction to go through.