When I go to CSS Code on line 4 show a yellow exclamation mark and display this:
Element (li.active) is overqualified, just use .active without element name

CSS Code

#header{
margin: 0 auto;
}
.lp-header .navbar-default .navbar-nav>  li.active>a{
    color:#4d900c;
}

And don't show Social Media Buttons Why?

Thanks