Sphinx: how to set the color of visited links (sphinx_rtd_theme)

Question

I am currently creating a Sphinx document using the sphinx_rtd_theme. I would like to know how to change the color of visited links.

So far, I have only found possibilities using the classic theme (using html_theme_options in conf.py file). I however need to use sphinx_rtd_theme.

I guess there are possibilities using a local css file (in _static). For instance, I already use a css file to specify the theme color:

.wy-side-nav-search, .wy-nav-top {
    background: #0b750a;
}

Any hints?