/usr/share/horde/js/syntaxhighlighter/styles/ is in php-horde-mime-viewer 2.1.2-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/horde/js/syntaxhighlighter/styles/shCore.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreDefault.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreDjango.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreEclipse.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreEmacs.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreFadeToGrey.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreMDUltra.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreMidnight.css
/usr/share/horde/js/syntaxhighlighter/styles/shCoreRDark.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeDefault.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeDjango.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeEclipse.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeEmacs.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeFadeToGrey.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeMDUltra.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeMidnight.css
/usr/share/horde/js/syntaxhighlighter/styles/shThemeRDark.css