There are many aspects to web security, not all of which are related to HTTPS and not all of which are visible to a visitor to the site. Therefore the overall question of whether your site is “safe” is a complicated one and not one that I’m able to answer. For example, as discussed in some earlier forum threads, HTTPS sites can still be vulnerable to hacking because the HTTPS security only protects transmitted information against interception by network operators, but doesn’t guarantee that the site’s software or infrastructure itself is secure.
In terms of HTTPS security, your site has a mixed content error which will prevent some browsers from marking the connection as secure. This is due to some hard-coded non-HTTPS resources loaded in the page.
For example in one place your site refers to
<link href='http://fonts.googleapis.com/css?family=Lato:100,100italic,300,300italic,regular,italic,700,700italic,900,900italic' rel='stylesheet' type='text/css'>
This is an insecure stylesheet reference and needs to be replaced with the corresponding HTTPS link.
The service https://www.whynopadlock.com/ will scan your site for mixed content problems and explain which resources are being loaded insecurely if you can’t tell.