Portfolio Titles

Hi, I would like to add a thin line under every portfolio cover image. Is this possible? Something like this: 

My website is: www.laurapulecio.com 

Add to Design > Custom CSS

a.grid-item .grid-image {
   border-bottom: 5px solid green;
}

Thank you so much. How can I add space between the image and the line and also make it closer to to the text just like the example? Right now it is right under: 

On 6/10/2023 at 3:27 AM, Lpulecio said:

Thank you so much. How can I add space between the image and the line and also make it closer to to the text just like the example? Right now it is right under: 

I see you figured it out with this code?

a.grid-item .portfolio-title {
    border-top: 1px solid #000;
}