Background area too large on iPhone

Hello,
two questions:

1. When I click on the "Shop" on the website http://pixelway.de/projekt-shop-2, I want the display of the purple background on the smartphone to be shorter, it simply displays too much space and therefore must first scroll to the product.

2. At the bottom of the screen there are two buttons in purple, for forwards and backwards, unfortunately you can see the arrows in black very badly, where can I change the arrows to white.

Thanks

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