Snowman text-decoration:none not working

Hi!
I'm making a game with Snowman, and I have this CSS code in my game:

a {
    text-decoration: none!important;
}

However, the game simply ignores it, it seems. The underline for links is still there, and I've tried pretty much everything, including:

.passage a
a:link
tw-link

...but none seem to work. The weird thing is, if I make this change:

a {
    background-color: yellow;
    text-decoration: none!important;
}

...then the yellow background for links is visible, without any problems. So what could be the issue here? Is the text-decoration hard-coded into Snowman? I've tried using no text-decoration for Sugarcube and Harlowe and it works perfectly.

Thank you for any assistance.