Slider - when screen zoom less than 100% then grey space on the right side


I am a beginner in WordPress so I apologize for a dummy question in advance.

I am using Rambo theme PRO version. 

My slider images work perfectly and I am very satisfied with Rambo theme. However, one week ago I have noticed that when I decrease screen zoom to less then 100% the slider images will remain left aligned and on the right side a grey empty space appears. All my slider images are 1600 x 437px. Everything else in the homepage (services, blog news etc.) would appear smaller but still center-aligned. 

Is there any chance to center-align the slider image and make the left and right empty spaces just white?

Could you help me please?

Thank you very much.


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