foundry/Data/modules/pf2e-modifiers-matter/styles/pf2e-modifiers-matter.css

:root {
    --pf2emm-color-essential: #008000;
    --pf2emm-color-essential-outline: #008000bf;
    --pf2emm-color-helpful: #91a82a;
    --pf2emm-color-helpful-outline: #91a82abf;
    --pf2emm-color-harmful: #ff0000;
    --pf2emm-color-harmful-outline: #ff0000bf;
    --pf2emm-color-detrimental: #ff852f;
    --pf2emm-color-detrimental-outline: #ff852fbf;
}

/*
I added #chat-log to all of these CSS selectors to increase their specificity, so that they override the pf2e system styles.
(having an ID makes them more specific than the pf2e css styles, which only have classes for these)
*/
#chat-log .pf2emm-highlight {
    font-weight: bold;
}

#chat-log .tag_alt.pf2emm-is-ESSENTIAL {
    background-color: var(--pf2emm-color-essential);
}

#chat-log .tag_alt.pf2emm-is-HELPFUL {
    background-color: var(--pf2emm-color-helpful);
}

#chat-log .tag_alt.pf2emm-is-HARMFUL {
    background-color: var(--pf2emm-color-harmful);
}

#chat-log .tag_alt.pf2emm-is-DETRIMENTAL {
    background-color: var(--pf2emm-color-detrimental);
}

#chat-log .tag_transparent.pf2emm-is-ESSENTIAL {
    color: var(--pf2emm-color-essential);
    box-shadow: inset 0 0 0 1px var(--pf2emm-color-essential-outline);
}

#chat-log .tag_transparent.pf2emm-is-HELPFUL {
    color: var(--pf2emm-color-helpful);
    box-shadow: inset 0 0 0 1px var(--pf2emm-color-helpful-outline);
}

#chat-log .tag_transparent.pf2emm-is-HARMFUL {
    color: var(--pf2emm-color-harmful);
    box-shadow: inset 0 0 0 1px var(--pf2emm-color-harmful-outline);
}

#chat-log .tag_transparent.pf2emm-is-DETRIMENTAL {
    color: var(--pf2emm-color-detrimental);
    box-shadow: inset 0 0 0 1px var(--pf2emm-color-detrimental-outline);
}

#chat-log .pf2emm-suffix.pf2emm-is-ESSENTIAL {
    color: var(--pf2emm-color-essential);
}

#chat-log .pf2emm-suffix.pf2emm-is-HELPFUL {
    color: var(--pf2emm-color-helpful);
}

#chat-log .pf2emm-suffix.pf2emm-is-HARMFUL {
    color: var(--pf2emm-color-harmful);
}

#chat-log .pf2emm-suffix.pf2emm-is-DETRIMENTAL {
    color: var(--pf2emm-color-detrimental);
}