[Acelerate] How can I edit the slider dimensions?

The only way you can make it smaller is by defining the height for example you could say height:400px.
This would still allow content to spill outside the container.

You would need to set overflow to either hidden or auto to contain the data. If you set it to hidden you data will be clipped and if you set it to auto you will get scroll bars.

Another method would be to set the sidebar as a flex container with a direction of column. The items would then stack vertically instead of horizontally and you could set a margin of auto for the items you want to force to the bottom of the screen.

Not sure why you would want to do this. In the box model which html uses the height of the box is usually determined by the content. It doesn’t reach to the bottom of the screen unless it is forced to.