Add a text at the center of a slider

Hello,
try add this Custom CSS:

.pgcsimplygalleryblock-slider-title-wrap {
    bottom: 0;
    top: 0;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

Thank you, but how should I use it? I guess I have to add it as a custom class in the slider block, but how can I set the text?

@gallerycreator could you please reply to me?

Try adding a title for each image

@gallerycreator I’ve tried it, each image has a title by default, I’ve also tried by adding alt, description and so on

try add Caption

@gallerycreator I’m sorry, I had to enable thumbnails captions, thank you