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Freeform Gradient/ Responsive image as background

Hey all I’m having trouble with a freeform gradient I made in Illustrator as a background image for the web. the width is 1920 on the image however I was pretty sure that there was a way to stretch that image horizontally when the screen is larger and stay in place when the screen size shrinks. It does neither of these.

https://preview.webflow.com/preview/saint-lavie?utm_medium=preview_link&utm_source=designer&utm_content=saint-lavie&preview=cbfa8ff8e96a679f4571397c07238e68&mode=preview