#silde-github:before {
    position: absolute;
    top: 8px;
    left: 0;
    width: 18px;
    height: 18px;
    background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAYAAADgdz34AAAAGXRFW…7WHPxjDmwpRTcH3nvVHJiU0tzdOIFCI9pLc2C0f1u+AgwAhM1SNm+ETm4AAAAASUVORK5CYII=) no-repeat center center;
    background-size: 100% 100%;
    content: "";
}