Thank you for reinstating those links!
You could definitely set the background to white on those buttons, get the link colour to match with the rest of your site’s links, and also set the font to Lato with the following snippet:
.site-main .post-navigation, .site-main .paging-navigation, .site-main .post-navigation .nav-previous a, .site-main .paging-navigation .nav-previous a, .site-main .post-navigation .nav-next a, .site-main .paging-navigation .nav-next a {
background: #FFF;
color: #6DAE90;
font-family: Lato;
}
The following would then target the arrows, specifically:
.site-main .post-navigation .meta-nav:before, .site-main .paging-navigation .meta-nav:before, .site-main .post-navigation .nav-next a:hover, .site-main .paging-navigation .nav-next a:hover {
background: #FFF;
color: #6DAE90;
}
In addition, the following would be need to change the hover effect of the links from white to the default colour:
.site-main .post-navigation .nav-previous a:hover, .site-main .paging-navigation .nav-previous a:hover {
color: #6DAE90;
}
Give that a try and let me know how it works for you. ??