add custom css for AMP mode

/* add custom css for AMP mode */
function fix_rtl_mode_on_amp() {
    ?>
    .rtl .jeg_reviewstars .reviewscore,
    .rtl .jeg_storelist li .priceinfo,
    .rtl .jeg_reviewbars .reviewscore {
        float: left;
    }
    .rtl .jeg_reviewdetail li {
        padding-right: 22px;
        padding-left: unset;
    }
    .rtl .jeg_reviewdetail li > i {
        right: 0;
        left: unset;
    }
    .rtl .dealstitle {
        float: right;
    }
    .rtl .bestprice {
        float: left;
        text-align: left;
    }
    /* Font Awesome Right to Left */
    /* Horizontal Flip */
    .rtl .fa-star-half-o {
        -moz-transform: scale(-1, 1);
        -webkit-transform: scale(-1, 1);
        -o-transform: scale(-1, 1);
        -ms-transform: scale(-1, 1);
        transform: scale(-1, 1);
    }
    <?php
}
add_action( 'amp_post_template_css', 'fix_rtl_mode_on_amp' );