Kann man, da würde ich aber was anderes nehmen, einen Stern zum Beispiel:
CSS
/* Weihnachtsstern Avtare */
@include screen-lg {
.messageSidebar .userAvatar > a {
position: relative;
&::after {
top: 0;
right: 0;
height: 40px;
width: 40px;
position: absolute;
content:"";
display: block;
background-repeat: no-repeat;
background-size: contain;
background-image: url('data:image/png;base64,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')
}
}
}
Alles anzeigen