day letters are offset from day numbers

[dansgithubuser]

(screenshot from https://antoniandre.github.io/vue-cal/, ubuntu, firefox (same result with chrome))

.vuecal__weekdays-headings, .vuecal__all-day {
    padding-right: 12px;

I think coming from here: https://github.com/antoniandre/vue-cal/blob/973bf2852decfb8d2cefa35695766aee860ad765/src/vue-cal/index.vue#L1180

So maybe it's related to https://github.com/antoniandre/vue-cal/issues/221 ?