dotted line at the top bar - color change

edited November 20 in Muffin Builder
Hello, 
I have choosen "SPORT" theme. I customised it. My website is almost ready but I can not change one important thing. 
There is a green dotted line under the top bar. I really need to change its color but I don't know where I can do it.
website: dobrzegada.eu
Please help,
Michal

image

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