Mermaid: arrow not visible in sequence diagram

[Torikeshi]

Seeing a similar issue in sequence diagrams:

Here’s a CSS snippet that resolved the issue for me:

/*
    Fixes the arrowhead color in the element referenced by Mermaid sequence diagrams' marker-end attribute.
    (The default is #333, which doesn't show up on dark backgrounds.)
*/
.mermaid [id$="arrowhead"] path {
    fill: var(--text-muted) !important;
    stroke: var(--text-muted) !important;
}

[WhiteNoise]