css - Centering components in a Layout -

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i'm trying center picture , label vertical layout here's code wrote: 

    picture = new embedded(null,  brandableresourcehelper.getinstance().newresource("image/icon.png"));     lab = new label();     lab.setwidth(100, units_percentage);      verticallayout col = new verticallayout();     col.addcomponent(picture);     col.addcomponent(lab);     col.setwidth(30, units_percentage);     col.setcomponentalignment(picture, alignment.middle_center);     col.setcomponentalignment(lab, alignment.middle_center);

here's wanna get:

enter image description here

here's i'm getting:

enter image description here


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