Slider arrows and offset


In the below link I have a simple slider. There’s two aspects of the native slider I’d like to change, but unsure of the best way to do it. I would like the left and right buttons to sit under the slider in the centre, I can’t get them there, what is the best way to achieve this?

Also I’d like to start the slider offset, so it shows half the first slide and half the last slide with two in the middle. I’ve set the VW on each slide, and I’m just putting a negative percentage value on the slider to get. Is that the best way?

Thanks a million.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

And here is the link: Webflow - Plantquest