How do u add a filter to a bunch of stamps

I have a lot of stamps in my profile, and i want them to match the overall aesthetic of my layout. 

I think what would work is making them greyscale and adding a blue tint on top, but i only want to do it for the stamps, not for the entire layout. (or if thats not possible, only greyscale is OK).

could someone help pls i dont have the brains for ts😓😓

.bio-text img {
  filter: sepia(40%) hue-rotate(125deg);
}

ofc the sepia and hue-rotate are variables

just toy around with the values until they're as you want em

:3

someone already responded but yeah, put your stamps in a span/div with a random class name, then take that class name and add a filter to it in your layout box. the common way is to do sepia with a hue rotation but you can do other stuff