How to set mermaid sequence diagram css of arrowhead?

Help
1

What I’m trying to do

I want to set he color of arrowhead in sequence diagram. But not work.

Things I have tried

.messageLine0 {
    marker-end: 'url(#arrowhead)' !important;
}

#arrowhead {
    fill: blue !important;
}

Thanks for help!

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