Products are on the right side of a column

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Hello all,

I am using Product Catalog Simple version 1.6.14.
The pictures of products are not centered after adding the following CSS code:

.per-row-1 .modern-grid-element {
max-width: 300px;
margin: 10% auto;
float: none;
}

I have used the following shortcode:

[show_products per_row=1]

What can I do to correct this issue?
Thank you for your help.

With kind regards,
Willem-Jan

This topic was modified 12 hours, 20 minutes ago by TheStingPilot. Reason: Version added