CSS Center align Divs

I have a section of a page that can have up to five boxes across that contain dynamic content.  Right now I have the bo class floating left.  However, if I have 1, 2 or 3 boxes I want them to center on the page, not float.  How do I do that?

.related-product-box {

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F IgorDeveloperCommented:
Try using relative margin. See an example  at https://jsfiddle.net/FranIg/2tmvvqoj/

.related-product-box {
        margin: 3%;

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Julian HansenCommented:
Firstly I would suggest taking a look at one of the responsive frameworks like Bootstrap or Foundation. If you are not able to implement them then there is still benefit to look at their CSS to see how they deal wit these things.

For instance - you want up to 5 boxes floated left but your width is 23% with padding either side of 1% suggesting only four boxes.
Either way - if you look at the Responsive Grid CSS of one of the frameworks above you will see they have some neat tricks to getting around the padding issue.

Firstly make your widths exact percentages of the proportion of the screen they will use - so if four boxes then 25%, five boxes 20% etc.

Make your padding: 15px 0. To stop the boxes extending more than 100% because of the padding make your box-sizing: border-box. This has the effect of including the padding in the width of the box rather than adding to it.

Then look at how the frameworks enclose grid cells in a row class that has margin-left: -15px and margin-right: 15px to counter the outer padding on the first and last elements as well as a clear: both to clear the floats.

Here is a sample using Bootstrap that demonstrates the concept. The sample includes two custom classes (.row-centered and .col-centered that extend the bootstrap styles to achieve the desired effect.

You can look at the Bootstrap.css file to see how .row, .col-lg-3 are defined - there is not much styling that is needed to achieve the effect.

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