Make images black and white by default and colored on hover

Add this code to the Custom CSS field on the Style tab of your Instagram Feed widget’s settings:

.es-post-media-image {
filter: grayscale(1) !important;
}
.es-post:hover .es-post-media-image {
filter: none !important;
}

Let us know if the solution worked for you :slightly_smiling_face: