Customize +/- slider

[admin]

This should do the trick:

Code:

.usermode .slider-alt .slider-v .slider,
.slider-alt .slider-v .slider .progress {
  height: 350px;
  width: 5px;
  padding: 0 30px;
}

It removes empty space from top/bottom where min/max buttons are usually placed. But since you have hidden them this space should be removed.