Comment by kevindamm

Not sure of tool/IDE but you can achieve that effect in HTML/CSS by use of text-shadow at 0px 0px and a reasonable value for the blur radius (maybe 5px or so).

In computer graphics a similar glow effect is usually done by blurring and rendering that just under the source image/mesh. Pretty similar to the above.

Sorry don't have an idea of the tool in use by the author.