<div class="contents">text</div>
<ul class="cp_snslink05">
<li class="cp_link facebook"><a class="fa fa-facebook" href="#"><span>Facebook</span></a></li>
<li class="cp_link twitter"><a class="fa fa-twitter" href="#"><span>Twitter</span></a></li>
<li class="cp_link google"><a class="fa fa-google-plus" href="#"><span>Google+</span></a></li>
<li class="cp_link instagram"><a class="fa fa-instagram" href="#"><span>instagram</span></a></li>
</ul>

* {
	-webkit-box-sizing: border-box;
	        box-sizing: border-box;
}
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;
}
.cp_snslink05 {
	position: fixed;
	top: 50%;
	left: 0;
	display: inline-block;
	margin: 0;
	padding: 0;
	list-style-type: none;
	-webkit-transform: translateY(-50%);
	        transform: translateY(-50%);
}
.cp_snslink05 .cp_link a {
	position: relative;
	font-family: 'FontAwesome';
	display: block;
	width: 40px;
	height: 40px;
	padding: 10px;
	-webkit-transition: background 0.5s ease 0.3ms;
	transition: background 0.5s ease 0.3ms;
	text-align: center;
	text-decoration: none;
	color: #ffffff;
	background: #263238;
}
.cp_snslink05 .facebook a:hover {
	background: #3b5998;
}
.cp_snslink05 .twitter a:hover {
	background: #00acee;
}
.cp_snslink05 .google a:hover {
	background: #dd4b39;
}
.cp_snslink05 .instagram a:hover {
	background: linear-gradient(45deg, #fdf497,#fd5949,#d6249f,#285aeb );
}
.cp_snslink05 .cp_link:first-child a {
	border-radius: 0 5px 0 0;
}
.cp_snslink05 .cp_link:last-child a {
	border-radius: 0 0 5px 0;
}
.cp_snslink05 .cp_link a span {
	visibility: hidden;
	display: inline-block;
	position: absolute;
	min-width: 7em;
	top: 0.5em;
	left: 60px;
	line-height: 1em;
	padding: 8px;
	-webkit-transition: all 0.5s ease 0.3ms;
	transition: all 0.5s ease 0.3ms;
	transform: rotateY(45deg);
	transform-origin: 0;
	text-align: center;
	opacity: 0;
	color: #ffffff;
	border-radius: 5px;
	background: #263238;
}
.cp_snslink05 .cp_link span:after {
	position: absolute;
	top: 6px;
	left: -15px;
	display: block;
	width: 0;
	height: 0;
	content: '';
	border: 10px solid transparent;
	border-right: 10px solid #263238;
}
.cp_snslink05 .cp_link a:hover span {
	visibility: visible;
	transform: rotateY(0);
	opacity: 1;
}