.emoji-block {
    text-indent: -9999em;
    image-rendering: optimizeQuality;
    font-size: inherit;
    height: 17px;
    width: 17px;
    top: -1px;
    position: relative;
    display: inline-block;
    margin: 0 .15em;
    line-height: normal;
    vertical-align: middle;
    background-image: url(../img/sprite.png);
    background-repeat: no-repeat;
}