Images same height but not same width

Dear Developer,

we are using your plugin and it works fine! But we want to show different images in the same height, but the width is different.

So is there any css we can customize it?

I tried it with:

.carousel-slider .owl-item img{
/*display: block; */
width: auto;
max-width: 328px;
max-height:209px;
}

But it doesnt works.

This is how it should look like:
https://ibb.co/0mn53St

Thanks in advance,
kind regards!