<div class="contents">text</div>
<div class="cp_snslink07">
<ul class="cp_link_list">
<li class="cp_link facebook"><a href="#"></a></li>
<li class="cp_link twitter"><a href="#"></a></li>
<li class="cp_link instagram"><a href="#"></a></li>
</ul>
</div>

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_snslink07 {
  position: fixed;
  top: 0px;
  width: 100%;
  border-top: 10px solid #90CAF9;
}
.cp_snslink07 ul.cp_link_list {
  position: absolute;
  right: 1%;
  display: flex;
  gap: 5px;
  margin: 0;
  list-style: none;
}
/*それぞれのSNS iconの設定*/
.cp_snslink07 .cp_link {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50px;
  height: 50px;
  padding: 0;
  transition: all 0.3s;
  border-radius: 0 0 8px 8px;
  background: #90CAF9;
  box-shadow: 0 3px 3px 0 rgba(0,0,0,0.2);
  transition: all 0.3s;
  cursor: pointer;
}
/*SNS各種ロゴ*/
.cp_snslink07 .cp_link.facebook::before,
.cp_snslink07 .cp_link.twitter::before,
.cp_snslink07 .cp_link.instagram::before {
  position: absolute;
  content: '';
  background-size: contain;
  background-repeat: no-repeat;
  width: 25px;
  height: 25px;
}
/*facebook*/
.cp_snslink07 .cp_link.facebook::before {
  background-image: url(facebook_logo_secondary.svg);
}
/*twitter*/
.cp_snslink07 .cp_link.twitter::before {
  background-image: url(x-logo.svg);
}
/*instagram*/
.cp_snslink07 .cp_link.instagram::before {
  background-image: url(instagram_glyph_white.svg);
}
/* hover時の動きの設定 */
.cp_snslink07 .cp_link:hover {
  height: 53px;
  box-shadow: 0 0px 0px 0 rgba(0,0,0,0);
}
/*SNS各種ロゴ背景を変える*/
/* facebook */
.cp_snslink07 .cp_link.facebook:hover::before {
  background-image: url(facebook_logo_primary.svg);
}
/* twitter */
.cp_snslink07 .cp_link.twitter:hover::before {
  background-image: url(x-logo-black.svg);
}
/* instagram */
.cp_snslink07 .cp_link.instagram:hover::before {
  background-image: url(Instagram_glyph_gradient.svg);
}