Sarfraz already mentioned overflow-xthat it is one of the answers, although it means (as said!) That everything that would be to the right is now inaccessible to the user. There are use cases for this, but it’s generally not advisable to disturb content that the user cannot access.
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<p>...lots of text here...</p>
... :
<p style='width: 1200px'>...lots of text here...</p>
... 1200 .
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