Issue-keyword border is too light in issues/PR

Example:

Duplicate of #123


What color now is used:

.issue-keyword {
    border-bottom: 1px dotted var(--color-auto-gray-4);
}

#fff” should be better as long no definied color similar to “var(--color-text-primary)”:

.issue-keyword {
    border-bottom: 1px dotted #fff;
}