How To Center Image Captions?

Hi,

I am using the Image Widget but it no longer centers the captions below the images.

I’ve tried using:

.so-widget-sow-image, .so-widget-sow-image .widget-title {
text-align: center;
}

This should center the image captions but it makes no difference.

You can see it here. All captions are aligned left.

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Please help.