What is causing this css border? [closed]

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On my page, spec.itslimetime.net, there is a really odd silver border being applied directly below the nav menu only when the viewport is less than 500 px. It must be javascript related because it only appears (fades in) once you scroll down the page a little bit.

I have searched high and low using dev tools. Can anyone help me figure out where it is coming from?

Thanks.

Answer 1

Its this:

.header-3-startup-antiflicker {
    border-bottom: 1px #bdc3c7 solid;
}

which is inserted right at the bottom of your page.

Edit: But Jonathan Lonowski is right, this isn't really what stackoverflow is for.