How to center the slideshow?

Hi,
I am on a localhost for the moment, so difficult to send you and URL.

I read your answer and done what you say but it does’t work;.

Precisely, I insert
.slideshow_container {
margin: 0 auto; /* This centers the slideshow, if the slideshow has a maximum width. */
}
in a customed style that i called “centrage”. It gives (the first lines)
“
.slideshow_container a { text-decoration: none; }
.slideshow_container a:hover { text-decoration: none; }
.slideshow_container {
margin: 0 auto; /* This centers the slideshow, if the slideshow has a maximum width. */
.slideshow_container .slideshow_slide_image { }
.slideshow_container .slideshow_slide_video { }
.slideshow_container .slideshow_slide_text { }
“

I indicated that customer style “centrage” as default in the settings, and even indicated it in my slideshow.

What’s wrong ?

thanks