Option A (easiest): Use a popup/modal plugin
Look for a plugin that supports “open popup on click” and lets you put text content inside.
Common options:
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Popup Maker (popular; good for “click to open” text popups)
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Elementor (if you use Elementor Pro, it has Popups built-in)
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Kadence Blocks / Spectra / GenerateBlocks (some setups can do modals; depends on your stack)
Generic steps (Popup Maker-style):
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Install/activate the popup plugin.
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Create a new Popup called “Full Article”
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Paste your article text into the popup content.
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Set popup size, scrolling, and show the close “X”.
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Create a button/link on your page that says “Read full Article”
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Link that button to the popup trigger (usually the plugin gives you a CSS class like popmake-123 or a shortcode trigger).
This is the cleanest if you don’t want to mess with code.