Custom image for your toast button
in your theme, add the css code:
.upvote-button svg {
display:none;
}
.upvote-count::before {
/* tiny picture of a bear */
background: url("https://i.imgur.com/laDt4Yfs.png");
display:block;
width:30px;
height:30px;
background-size:cover;
content: "";
}