I think you already figured it out. 

@dodo06 Can you share screenshot for better understanding?

 How can i make the default dawn theme sort by option like the image above. On hover the option color will be gray instead of blue and change size of option menu. Thank you

@ProtoMan44 not a 404 error, The site crashes....Yes I have tried on new store in different account and different laptops  

@ProtoMan44 If i knew why would i post here and ask others? have you tried it on any of your own dawn theme store?  

@ProtoMan44 As I mentioned above i also tried with the new Dawn theme in a different account but the same thing happened so it is not a conflict of my code.Thanks

@ProtoMan44 I did and the same thing happened. it does not crash when you add it?

Hey @ProtoMan44  here is the linkhttps://d4h58dktd56by9hb-68170547447.shopifypreview.com Thanks 

In Dawn theme when I try to add the transition property for a smooth scroll down of mega menu in header. The site crashes with and error and not even reload until I close the tab and open it again on new tab. I have also tried with new dawn theme so ...

@Dan-From-Ryviu  Can you check this on any windows pc/laptop? Because I have windows. 

Hi @Dan-From-Ryviu I have also tried on other laptops but the issue remains the same. Thanks.

Here is the preview link of the store:https://w2z16pgzg1xefm31-68170547447.shopifypreview.com

In Dawn theme when I try to add the transition property for a smooth scroll down of mega menu in header. The site crashes with and error and not even reload until I close the tab and open it again on new tab. I have also tried with new dawn theme so ...