.custom-faq p.toggler:after {
    content: "";
    background-image: url(https://ik4ux8p2ej.wpdns.site/wp-content/uploads/2016/09/arrow-down.png);
    width: 54px;
    height: 10px;
    position: absolute;
    bottom: 30px;
    left: 50%;
    margin-left: -27px;
}

.custom-faq p.toggler.activeTitle:after {
    background-image: url(https://ik4ux8p2ej.wpdns.site/wp-content/uploads/2016/09/arrow-up.png);
}