If the consent bar doesn't seem responsive, this might be caused by CSS of the active theme or a plugin. To force the bar to size properly, you can use this CSS snippet in your theme customizer, child theme CSS file, or at any other decent spot:
#gdprc_bar .container {
width: 100% !important;
}
As of version 1.3.4 custom CSS can be added like the above snippet. The bar (and consent screen) can also be styled according to corporate branding.