Hey,
I was having the same issue on my site so I thought I'd share my solution in case it helps someone else.
As the dot is a link, I didn't want to mess around with any Javascript to automatically activate it. Instead I gave it a background colour and then rounded it to make it look like a bigger dot.
Here's the code to be added in Design > Custom CSS:
.sqs-lightbox-meta-trigger {
background-color: #000;
border-radius: 50%;
}
Hope it'll help someone!