/usr/share/javascript/jquery-ui-themes/mint-choc/jquery.ui.base.css is in libjs-jquery-ui-theme-mint-choc 1.8.24+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | @import url("jquery.ui.core.css");
@import url("jquery.ui.resizable.css");
@import url("jquery.ui.selectable.css");
@import url("jquery.ui.accordion.css");
@import url("jquery.ui.autocomplete.css");
@import url("jquery.ui.button.css");
@import url("jquery.ui.dialog.css");
@import url("jquery.ui.slider.css");
@import url("jquery.ui.tabs.css");
@import url("jquery.ui.datepicker.css");
@import url("jquery.ui.progressbar.css");
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