/usr/share/javascript/bootstrap/less/mixins/background-variant.less is in libjs-bootstrap 3.3.7+dfsg-2.
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 | // Contextual backgrounds
.bg-variant(@color) {
background-color: @color;
a&:hover,
a&:focus {
background-color: darken(@color, 10%);
}
}
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