I am creating an admin area using Bootstrap. When I resize my screen via dragging it and making it smaller, the website looks exactly how I would expect:

However when I view it on mobile it zooms out and looks like it tries to show the whole screen. Like below

Has anyone experianced this issue before with Bootstrap? I'm thinking it could be a Javascript issue where it doesn't detect the size of the browser?
Use
<meta name="viewport" content="width=device-width, initial-scale=1">
in the <head> section of your HTML document.
This means that the browser will (probably) render the width of the page at the width of its own screen.
— Chris Coyer on CSS-Tricks
You can check MDN for more information about the viewport meta tag and its usage.
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