How to add photographer credits to right hand corner of banner images?

Site URL: https://www.thereverieco.com/

Hi, I would like to credit photographers under banner images on my site. I want small text in the right hand corner of the image to credit photographers. Right now, I can't make the spacing work or I can only do it creating a small black bar below the banner image but it's too much space (see styled lounges on my website). 

https://www.thereverieco.com/

password: whistler1!

Can someone help?

Add to Design > Custom CSS

div#block-yui_3_17_2_1_1642467230375_11331 {
    position: absolute;
    top: -40px;
    right: 20px;
}
div#block-yui_3_17_2_1_1642467230375_11331 * {
    color: white;
    font-size: 12px;
}

Find credit text id with this tool: https://chrome.google.com/webstore/detail/squarespace-id-finder/igjamfnifnkmecjidfbdipieoaeghcff?hl=en