\cancel argument is blank

[willymcallister]

The argument to \cancel is showing up blank. I changed from Katex 10.0.0 to 12.0.0 on my local MacBook. Same rendering in both. The code renders properly at katex.org. I'm using Katex in a Jekyll/Github site. Here's an example article (this is being rendered by 10.0.0). Scroll down a little to see the blank cancellations. Any tips on how to debug this?

Sample equation:
$\dfrac{dx}{r^2} = \dfrac{\blueD{\cancel{a}\, \cancel{\sec^2 \theta} \,d\theta}}{\maroonD{a^{\cancel{2}} \, \cancel{\sec^2 \theta}}}$

[ylemkimon]

The background-color and border-radius of SVGs are overridden by https://spinningnumbers.org/assets/main.css:

svg {
    background-color: var(--img-background-color);
    opacity: 1.0;
    border-radius: 4px;
}

You can make the rule above more specific or add following:

.katex svg {
    background-color: initial;
    border-radius: initial;
}