.reactions .reaction-button:not(:first-child) {
display: none;
}
.reactions .reaction-button:first-child img {
filter: saturate(0)brightness(1.5);
}
.reactions .reaction-button--active {
background-color: rgb(65 138 244 / .5);
}
.reactions .reaction-button--active:first-child img {
filter: saturate(0)brightness(3);
}

вот так идеально