Color changing of Navigation button

[scentsnsecrets]

I want to change the Color of my sale button and I have succeeded in it but it's only changing on my laptop screen, not on my smartphone.
Please, someone can resolve this issue for me
Thanks

#SiteNav > li:nth-child(1) > a > span {

    font-weight: bold;

  color: red;

}

[Ninthony]

You likely have a different navigation for mobile and desktop, can you share a link?

[scentsnsecrets]

Dear, thanks for your reply here is my online store link
https://scentsnsecrets.com/

[Zworthkey]

Hii, @scentsnsecrets 
Kindly share your store URL so,
I can solve it perfectly.
Thank You.

[scentsnsecrets]

https://scentsnsecrets.com/

[Zworthkey · Accepted solution]

Hii, @scentsnsecrets 
Paste this code on top of the theme.scss file.

li.mobile-nav__item.border-bottom:nth-child(1) a span {
    color: red !important;
}

Thank You.

[scentsnsecrets]

Thank for your help, it really works for my smart phone now