How to move the log in button from right to left?

The bbpress-login button is now floating to the right instead of the desired left: http://ift.tt/1PWeO9k

I inspected the elements using firepath and saw the following:

<div class="bbp-submit-wrapper">
    <button class="button submit user-submit" name="user-submit" tabindex="104" type="submit">Log In</button>

As well as this:

.bbp-submit-wrapper {
    text-align: right;
}

On firefox, when I add the line, the button does shift to the left

.bbp-submit-wrapper {
    text-align: right;
    float: left;
}

So I entered into the wordpress css.style and at the end I added:

.bbp-submit-wrapper {
   float: left;
}

But nothing changes, what should I do and why it didn't do anything?

via Chebli Mohamed