Vaadin + Liferay + Styles of OptionGroup and CheckBox ovewritten

Vaadin 6 / 7 / 8
1

Hi there,
I’m using Vaadin 7.1.14 and Liferay 6.2 and for now I’m testing some styles not with my own theme, instead I write new style rules into the styles.css in the reindeer theme.
For now I’m facing the problem, that all components look accordingly to the styles defined in this theme except the OptionGroup and CheckBox.
With firebug I can see that the aui styles overwrite the reindeer styles (in particular the style for the labels)
(See the attachment)
I’ve tried :

.v-select-optiongroup {
        font-size: 12px !important;
        line-height: normal !important;
        text-align: left !important;
        white-space: nowrap !important;
 }

It didn’t help =/

Any ideas?

13570.png