/usr/share/GNUstep/SOGo/WebServerResources/UIxMailPartExternalHTMLViewer.css is in sogo-common 2.2.17a-1.1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | HTML, BODY
{ background-color: #fff;
font-size: normal;
font-family: sans-serif; }
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