Photon CMS is based on our custom-built Proton UI theme. The theme is built upon Twitter Bootstrap version 3.3, and is fully responsive. We used to sell our Proton UI theme for 3 years in the Themeforest marketplace, so you may rest assured that it has no weird CSS bugs.
So is Photon CMS Control Panel.
We've further enhanced Photon CMS Control Panel to feature the Flexbox layout, as we're waiting for the new Photon CMS theme based on Twitter Bootstrap version 4 to be completed.
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Every Photon CMS Control Panel feature is built to be responsive, so that you can use the Control Panel using any device.