My Product Page first image of product start showing to small on mobile and desktop both as seen below:

Then I added following code in my theme file editor /assets/base.css
" .productView-image.fit-unset .productView-img-container img:not(.zoomImg) {
width: 500px !important;
height: 500px !important;
}
"
after using this code my image start showing good on desktop device but on mobile device it start showing starched image
Like this on my mobile:

You can try add this code @Testing120
@media only screen and (min-width: 600px) {
.productView-image.fit-unset .productView-img-container img:not(.zoomImg) {
width: 500px !important;
height: 500px !important;
}
}
@media only screen and (max-width: 600px) {
.productView-image.fit-unset .productView-img-container img:not(.zoomImg) {
width: 300px !important;
height: 300px !important;
}
}
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Delete the old code and replace it with the code above @Testing120
Glad to help you. Have a good day.
Hello @Testing120
Don’t use fixed width and height,
Use both 100%