Slider image showing too small on mobile Dawn Theme

[michelle925]

The slider image is not showing correctly on mobile using the Dawn Theme. On desktop it looks fine but on mobile it looks very zoomed out with a lot of blank space around the image. I tried attaching screenshots but its not the right format. My URL is www.fostermomthings.com

[michelle925]

Yes, I am comfortable editing the code. I have added code to different files before.