Add this code to the Custom CSS field on the Style tab of your widget’s settings:
.eapp-vimeo-gallery-info-component,
.eapp-vimeo-gallery-video-card-container {
text-align: center;
}
.eapp-vimeo-gallery-info-description {
margin: 0 auto;
}
.eapp-vimeo-gallery-info-component {
display: flex;
flex-direction: column;
align-items: center;
}
.eapp-vimeo-gallery-actions-item {
margin: 4px 0 4px;
}