.social a {
  display: inline-block;
  background: url(sns.png) no-repeat;
  width: 33px;
  height: 33px;
  text-indent: -9999em;
  margin-right: 21px;
}

.social a.facebook {
  background-position: 0 0;
}

.social a.youtube {
  background-position: -57px 0;
}

.social a.naver_blog {
  background-position: 100% 0;
}