Hi

We have used Photoshop to create banner images for Laptop, Tablet and Mobile. Did you check the responsiveness of the slider in all formats? Check all sliders in all pixels, you will understand that none of the slider is responsive.

Follow the steps below to check:
1. Open website and right click on banner.
2. Click on inspect element
3. On the top header keep the dimensions as responsive.
4. Start adjusting the screen size from Laptop to tablet to mobile

You’ll see that none of the image is responsive: that is none of them resizes to fit the screen area.