How can I set up a hover effect for images in the event section?

Site URL: https://freedomofmovement.squarespace.com/

Hello, I am in the process of building a site and would need your help. I am using the Growwell template and have a question about the event section.

I would like to set up a hover effect for the images on the event page. The images should darken when you move the cursor over them. Kind of like the 'Retreat' page but the other way around (see screenshots). Can anyone help me with this? 

Side Password: fom2022

Hi, try this CSS, you can adjust the filter type and brightness, as well as the transition speed to your liking:

.eventlist-column-thumbnail img {
  transition:ease-in-out 500ms;
}
.eventlist-column-thumbnail:hover img {
  -webkit-filter: brightness(0.8); 
  filter: brightness(0.8);
}