Customizing lightbox

Hi, I'm new here. I have 3 questions:

1)  I'm wondering how to customize the lightbox on this website with code? I want the background to be solid white and for the description to show below the image. Also for the image to be larger. Is there any way to have a title and a description, or only description?

The lightbox here is great but I don't have any idea how to do it:  https://www.lucasmasch.com/

2)  How do I get the dropdown links under 'work' to align the other way? The menu is too wide and the links align right instead of left. 

3) The margin between the menu and content on the 'Shop' page is enormous. I don't see any function to make it less so I guess I have to do it with code, but don't know how. 

Website:  https://cod-giraffe-b6w7.squarespace.com/

Haven't published the site yet so the password is 'sunflower'. 

Thank you for your help!!!

#1. Add to Design > Custom CSS

.gallery-lightbox-background {
    opacity: 1;
}

With description, you mean description Lightbox Mode?

#2. Use this CSS

.header-nav-folder-content {
    text-align: left !important;
    left: 50% !important;
    padding-left: 0 !important;
    margin-left: -1.5em !important;
}

#3. Use this CSS

section.products.collection-content-wrapper.products-list {
    padding-top: 0px;
}

Thank you! That fixed everything, except for adding the image descriptions to the lightbox...I've seen it done, but I don't know how to do it myself. For example:  https://www.sandihaberfifield.com/lineations  You can see the file description when the lightbox is open. 

Thanks so much for your help!!!

On 1/20/2023 at 2:22 AM, HadleyS said:

Thank you! That fixed everything, except for adding the image descriptions to the lightbox...I've seen it done, but I don't know how to do it myself. For example:  https://www.sandihaberfifield.com/lineations  You can see the file description when the lightbox is open. 

Thanks so much for your help!!!

Hi. Use code in this thread: 

Hi, I don't see the exact code I'm supposed to use. 

On 1/29/2023 at 2:27 AM, HadleyS said:

Hi, I don't see the exact code I'm supposed to use. 

This code https://forum.squarespace.com/topic/151777-gallery-caption-workarounds-for-71-round-two/?do=findComment&comment=333248