Leggy Beet Seedlings

I started a tray of beets indoors this year for the first time ever.

After they sprouted they started to get leggy.  I wasn't sure if they were under watered or over watered or what. 

I did what most people do.  I asked Google.  It said to put more light on them.  I did that, and nothing changed.

...they look like this.  Too much water or not enough?  Not enough light?  I've tried it all, but that tray doesn't hold much soil either.