carpseeds.pl/wp-content/themes/storefront/assets/css/admin/plugin-install.css

.sf-install-now.updating-message::before{display:inline-block;content:'\f463';font:normal 19px/1 dashicons;margin:0 5px 0 -2px;vertical-align:bottom;-webkit-animation:rotation 2s infinite linear;animation:rotation 2s infinite linear}