Gallery Image Change Size Dynamically

[ivan0313]

Allow user to view gallery images in difference sizes.

For example, a [lg, md, sm] switch, or a size slider.

Make sure the checkbox for image selecting is resized correctly after image size is changed and the checkbox color will detect its background average brightness and its color dynamically to ensure visibility of the checkbox.

[basil08]

Hey @ivan0313, I would like to look into this issue. Can you assign me?

[ivan0313]

@basil08 great to hear about your interest in contribute! Your help is much appreciated. Do read the contributing guidelines if you are unsure about anything, you will be assigned to the issue once you have submitted a PR linked to this issue.