Hi there!

Thanks for contacting us.

Would you please use the following code in your custom CSS:

body.com-content .blog .items-row.cols-3.row-fluid.clearfix {
    display: flex;
}

If you want some paddding among them, then the following code too:

body.com-content .blog .items-row.cols-3.row-fluid.clearfix .col-md-4 {
    padding: 0 10px;
}

Note: Path towards custom CSS: Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

Best Regards