Quantity Selector arrows are not Showing in Mobile View

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Hello Community.


I realized that the quantity arrows (that appears on product page and cart checkout) i have from default Debut Theme, are not showing in Mobile view, is just showing in bigger format. 


I have been trying to watch some tutorials and nothing has worked!


I think there are 2 options for this issue:


1-Change from default arows to plus minus arrows;

2-Make the default arrows appear on Mobile View;


How can i do to make the arrows appearing in Mobile view, or change from selector arrows to plus minus arrows in Mobile?