You can't expect a desktop-fitting page to show as it is and looks right on smaller screen devices such as mobile phones, this is the area for
HTML Responsive Web Design[
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More reading:
1.
The Three R’s of Responsive Web Design[
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Responsive Web Design Basics | Web | Google Developers[
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There are device emulators included in the developer tools of most modern browsers to simulate testing on real mobile devices virtually.
To launch the developer tools, press CTRL+SHIFT+I on Google Chrome and Firefox, You can toggle the device toolbar on which you can select different device types, screen configurations and rotations to test your web pages.