Center the pictures

Can you provide the site link please?

Hi.
You can see your plugin here (“Nos partenaires”): https://www.bouliacsportsplaisirs.org/
Thanks.

Try this CSS:

.wls-carousel .owl-item a {
    display: table-cell;
    height: 150px;
    vertical-align: middle;
}

Great, it’s working!
Last question: how can I add a space between each pictures (because they are bonded)?
Thanks.

Use following CSS and check it.

.wls-carousel .owl-item {
    padding: 0 10px;
}

Great! thanks ??