#wp-admin-bar-pagespeed_purge > a::after {
    margin: 5px;
    content: " ";
    font-family: dashicons;
    display: inline-block;
    width: 20px;
    height: 20px;
    font-size: 20px;
    line-height: 1;
    text-decoration: inherit;
    font-weight: 400;
    font-style: normal;
    vertical-align: top;
    text-align: center;
    -webkit-transition: color .1s ease-in 0;
    -moz-transition: color .1s ease-in 0;
    transition: color .1s ease-in 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#wp-admin-bar-pagespeed_purge > a.spin::after {
    content: "\f463";
    animation: animate-spin 1s infinite;
    animation-timing-function: linear;
}

#wp-admin-bar-pagespeed_purge > a.success::after {
    content: "\f147";
}

#wp-admin-bar-pagespeed_purge > a.error::after {
    content: "\f158";
}

@keyframes animate-spin {
    0% {
        transform: rotate( 0deg );
    }
    100% {
        transform: rotate( 360deg );
    }
}