Great websites are device agnostic
Someone might visit your website on a phone whilst on the bus, a tablet on the sofa, or a laptop at their desk. Your website must work on all of these devices.
We achieve this with responsive design – a technique that adapts layouts and elements so your site works seamlessly on any screen, from the smallest phone to the largest desktop monitor.
Consider using a mobile-first approach. Designing for the smallest screen first forces you to focus on what matters most, then scale up for larger devices.
Further reading
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The ideal viewport doesn't exist
A great demonstration of how vastly fragmented screen sizes are why responsive, fluid design.