You can use this CSS in the custom CSS for the review template.

.wprevpro_t1_DIV_2:before {
color: #695656;
}

You can find hex values here...

https://www.w3schools.com/colors/colors_picker.asp

More than likely this is some CSS adding some margins on mobile view. I need to be able to see it to investigate. Can you setup a test page?

Try adding this and see what happens...

.wppro_badge2_IMG_4 {
max-width: 32px !important;
}

It should be something like this...

https://www.productreview.com.au/listings/jims-cleaning-group-car-detailing

What are you using?

That is a bug for sure. It's funny no one has noticed this yet. If you switch over to the Advanced slider it will grey out that previous button on the first slide. I'll get this fixed in the next update.

Can you share a link?

Can you post the last Job ID?