A color discrepancy occurs when applying the theme color in the Zotero PDF reader.

A color discrepancy occurs when applying the theme color in the Zotero PDF reader.

In Zotero 7.0 official release, when using the "Change PDF background color" option from the Ethereal Style for Zotero plugin, I applied the following CSS code:

body #viewerContainer {
background-color: #ffffff00 !important;
filter: none !important;
}
.textLayer {
background-color: #dfedcb !important;
mix-blend-mode: multiply !important;
}

I want the displayed color to be #dfedcb, but it actually shows #eef5e4.
https://s3.amazonaws.com/zotero.org/images/forums/u15875786/q24izdapl5h803tya79b.png

However, in Zotero 7.1 BETA, when using the "Aa" theme color changer in the top-left corner of the reader, I applied background color #dfedcb and foreground color #000000. But the actual displayed color became #f8fbf4.
https://s3.amazonaws.com/zotero.org/images/forums/u15875786/mmexeqc2czbvu2zy0xuy.png

Only in Zotero 8.0 development build, when using the "Aa" theme color changer in the top-left corner of the reader, I applied background color #dfedcb and foreground color #000000. The actual displayed color finally matched my desired #dfedcb.
https://s3.amazonaws.com/zotero.org/images/forums/u15875786/efll4ps7cktwbw779kwb.png

I want to understand: What causes this color discrepancy? How should I modify the settings to make both Zotero 7.0 official release and 7.1 BETA display my desired colors correctly, just like in Zotero 8.0?
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