Gruviboxish Facebook by him

/* ==UserStyle==
@name           FB Gruv
@namespace      github.com/openstyles/stylus
@version        1.0.0
@description    A new userstyle
@author         Me
==/UserStyle== */

@-moz-document domain("www.facebook.com") {
    /* Insert code here... */
    :root{
    --fb-logo :#458588!important;
    --primary-button-background: #83a598  !important;
        --web-wash: #1d2021 !important;
    --story-unseen: #458588 !important;
        --progress-ring-blue-foreground: #458588 !important;
        --blue-link:#458588;
            --attachment-footer-background: #1d2021 !important
}
    div[class="x78zum5 xdt5ytf x1iyjqo2 x1n2onr6"]{
        display: none
    }
}