Enigma slider

Hello!
I would like to change the size of slider on my page because it’s way to big. On my Dashboard, in section Enigma: Stylesheet (style.css) I have found that I can change the width of slider:
.carousel-inner img{
width:100%;
But, the problem is that when I reduce it (for example to 60%), slider is set on the left side of the page and I would like it to be in the center of the page.
So, in conclusion, I want my slider smaller and in the center of the page.
Please, can you help me?