CF7 Check Boxes don't appear in Chrome

Hi,

I am using WordPress for our Photo Club website. I am using CF7 as a way to ask our members to vote for the best photos.

Using the checkbox function, the check boxes properly appear in front of the label when I use IE or Firefox but don’t appear when I use Chrome or the new IE Edge. In Chrome, the checkboxes are being replaced by tiny dots. I have read somewhere that I should use the fm-frm… function to specify the size of the checkboxes; I have tried unsuccessfully putting such a line in the Custom CSS window.

My WordPress and CF7 are up-to-date.

I am really green with WordPress, so a bit lost. I am trying hard but I am not finding any lead. Can someone please give me some inputs.

Here is the page where I ask people to vote:

http://www.clubphotovaudreuildorion.com/?p=4254

If you need any other info, please don’t hesitate.

Regards.