Day cell aligment depends on user agent stylesheet [Bug]

[asavartsov]

Vue2-datepicker version: 3.9.0
Vue version: 2.6.12
Browser: Google Chrome

In Google Chrome the datepicker depends on default user agent CSS with vertical-align property on tbody element which defaults to middle. This dependency shoud be avoided to not clash with user defined styles for tables. Also UA styles may change over time. Setting global vertical-align to tables also mangle with the datepicker. For example, my current project has sets baseline on tbody, which breaks aligment fo date cells.

Steps to reproduce

1. Override vertical-align property on tbody or tr to something other than middle
2. Open datepicker

Reproduction Link or Source Code

tbody {
  vertical-align: baseline;
}

The code

.#{$namespace}-table {
  /* ... */
  vertical-align: middle;
}

may have no effect in Google Chrome because it overrides it in tbody with own stylesheet and td inherits this propery from tbody.

Expected behavior
Rendering of datepicker does not change

Actual behavior
Date cells change alignment