Design your website to be mobile first
It's way easier to go from mobile to desktop than the other way around
When designing responsive web applications, start designing mobile before desktop.
To go from a mobile design to desktop design often requires few changes. You have more space to work with rather than less.
However, to go from a desktop to mobile design often requires you to omit UI elements, work with limited spacing, and overall work witha completely different mindset.
Subject your website to constraints. Growing a mobile design to fit desktop will be far easier than the other way around. By taking a mobile-first approach, you’ll not only improve the user experience for mobile users but also create a more streamlined and efficient design overall.