Images Not Displaying

[charleyeasy]

{{<gallery
    globalMatch="./sketch/*"
    sortOrder="asc"
    rowHeight="150"
    margins="5"
    thumbnailResizeOptions="600x600 q90 Lanczos"
    showExif=true
    previewType="none"
    embedPreview=true
    loadJQuery=true
>}}

I have confirmed that the image paths are correctly detected, but in the final HTML output, the width is set to 0, causing the images not to display.

Theme I am using: coder (GitHub link)

Inspecting the page elements, I can see that the image src points to a 600x409 image, but the rendered size is 0x262.
This might be caused by the style.css in the coder theme, which contains the rule:

img {
    max-width: 100%;
}

However, I am unsure how to fix this issue.

Any help would be greatly appreciated!