<div class="contents">text contents</div>
<ul class="cp_snslink03">
<li class="cp_link facebook"><a href="#"><div class="nav-label"><span>facebook Button</span></div></a></li>
<li class="cp_link twitter"><a href="#"><div class="nav-label"><span>X Button</span></div></a></li>
<li class="cp_link instagram"><a href="#"><div class="nav-label"><span>instagram Button</span></div></a></li>
</ul>

body {
  /*設置する親要素ページ全体ならbodyなど*/
  position: relative;
  height: 100vh;
  margin: 0;
  padding: 0;
}
.contents {
  /*サンプルはfixedの確認のためにheight指定しています。*/
  height: 2000px;
}
/*SNSリンクブロックの位置設定*/
.cp_snslink03 {
  position: fixed;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  display: block;
  overflow: hidden;
  margin: 0;
  padding: 0 0 0 5px;
}
/*それぞれのSNS iconの設定*/
.cp_snslink03 .cp_link {
  position: relative;
  right: -148px;
  margin: 10px 0;
  padding: 5px;
  background: #0097A7;
  border: 1px dashed #ffffff;
  border-right: none;
  box-shadow: 0px 0px 0px 3px #0097A7;
  cursor: pointer;
  transition: right 0.6s ease-in-out;
}
.cp_snslink03 .cp_link .nav-label {
  margin-right: 10px;
  padding: 0 0 0 25px;
}
.cp_snslink03 .cp_link.facebook::before,
.cp_snslink03 .cp_link.twitter::before,
.cp_snslink03 .cp_link.instagram::before {
  position: absolute;
  content: '';
  top: 50%;
  left: 5px;
  transform: translateY(-50%);
  background-size: contain;
  background-repeat: no-repeat;
  width: 1em;
  height: 1em;
}
/*facebook*/
.cp_snslink03 .cp_link.facebook::before {
  background-image: url(facebook_logo_secondary.svg);
}
/*twitter*/
.cp_snslink03 .cp_link.twitter::before {
  background-image: url(x-logo.svg);
}
/*instagram*/
.cp_snslink03 .cp_link.instagram::before {
  background-image: url(instagram_glyph_white.svg);
}
.cp_snslink03 .cp_link:hover {
  right: 0;
  background: #00bcd4;
  box-shadow: 0px 0px 0px 3px #00bcd4;
}
.cp_snslink03 .cp_link a {
  text-decoration: none;
  color: #ffffff;
}
.cp_snslink03 .cp_link:hover a {
  color: #80deea;
}