Sleek theme checkboxes have inconsistent hight checked/unchecked

[Former user]

When using the Sleek theme, then the checkboxes have different height depending on their checked status. They are higher when unchecked.

This can be corrected through setting the font-size to 14px for both "input[type="checkbox"] + label::before" and "input[type="checkbox"]:checked + label::before" and setting margin-right for "input[type="checkbox"]:checked + label::before" to 1px from 6px. They currently use a font-size of 16px and 12px.

[Arima B.]

Sleek is provided as is, please send a pull request if you want to fix it.