Add this code to the Custom CSS field on the Appearance tab of your FAQ widget’s settings:
@media (min-width: 600px) {
.eapps-faq-content-category-item-answer-video-wrapper iframe {
width: 50% !important;
}
.eapps-faq-content-category-item-answer-video-wrapper {
padding-bottom: 28.125%;
}
}