Hi
Thanks for contacting us. Use this custom CSS
.sppb-article-info-wrap>h3>a{
color:#640217 !important;
}
.sppb-readmore{
    color:#640217 !important;
}
.social-icon-facebook>a{
    color:#640217 !important;
}
.sppb-addon.sppb-addon-header.sppb-text-left>a>h5{
    color:#640217 !important;
}
.social-icon-facebook>a{
    color:#640217 !important;
}
.btn-primary, .sppb-btn-primary{
    background-color: #640217 !important;
}
Path towards custom CSS: Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.
-Regards.