This file is indexed.

/usr/share/ukui-screensaver/lock-dialog-default.css is in ukui-screensaver-common 1.1.2-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#auth-unlock-button {
    background-image: image(#024387);
    border-style: none;
    text-shadow: none;
}
#auth-unlock-button label {
    color: white;
}
#auth-unlock-button:hover {
    background-image: image(#0258AD);
}
#auth-unlock-button:active {
    background-image: image(#013C76);
}
#auth-unlock-button:disabled {
    background-image: image(#013C76);
}