Cannot set dialog width in ngDialog

I'm simply trying to set the width of the dialog box, and I haven't succeeded (yet). I have added a CSS class, but the width set is the one of the dialog shade.

.dialogwidth800 {
    width : 800px;
}
...
ngDialog.openConfirm({
    template: 'templateRemove',
    className: 'ngdialog-theme-default dialogwidth800',
    scope: $scope
}).then(

I have a fiddle here : http://ift.tt/1bFdxqo

Thanks a lot for your help !!!

G