621px is actually the width and 878px is the height, but either way, setting the height to the size of the image means that it won't scale down below that height. I've set the image to be the correct height on the different mobile platforms, so that's working fine, but I want the image to scale down to different desktop resolutions, as a lot of laptops still use 1280x800 resolution displays. This way the slider will scale down to fit in smaller resolutions, but hard coding the slider height doesn't allow me to do that.
Setting the slider to auto automatically resizes it to 300px. Then if I set each individual slide to auto and contain, the image resizes, but it crops off a massive portion of the bottom of the image because the slider container isn't recognising the correct height.
Also, if I set the minimum height of the slider, that works to a point, but the slider section doesn't respond to increase beyond that at higher resolutions