Vector illustrator image exports blurry for web in all formats
I've read many posts on this topic and followed the guidance but can't find a solution to my problem. Can anyone help?
I need to export a 898 x 225px Illustrator image for web use. Ideally in GIF format, but any web format can work. All objects are vectors, text is outlines. No matter how I do this, I get a pixelated, blurry result. With Legacy, using 'export as', even saving as PSD or pasting as a smart object in Photoshop and trying the same there. All blurry. I've tried as GIF, PNG and JPEG.
I'm also a bit confused about resolution. In the past I've exported at 72dpi for web but is it true that screens have a higher res now? Does that mean the image gets stretched? The image I've pasted below previews as smaller than it does on the website, see here: (link removed by moderator).
This header image is set in the stylesheet as the background image of a DIV that is the same pixel size as the image. Thanks!

