Do you mean the thumbnails of a Composition Slideshow widget or thumbnails you created and placed manually?
Can you please share the URL of your as well so we can also have a look at it?
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I find a solution. By making the page fixe, the thumbnails are fixe and dont resize. Now there are Sharpe.
Thanks for sharing the solution.
To rephrase your solution, the thumbnails images got sharp by simply setting page as fixed width.