Отсюда – Кнопки соцсетей для сайта на чистом CSS – https://v3c.ru/css/knopki-sotssetej-dlya-sajta
CSS
<style>
@import url(https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css);
.social a {
text-align: center;
width: 48px;
height: 48px;
float: left;
background: #fff;
border: 1px solid #ccc;
box-shadow: 0 2px 4px rgba(0,0,0,0.15), inset 0 0 50px rgba(0,0,0,0.1);
margin: 0 10px 10px 0;
padding: 6px;
color: #000;
}
.button-round a {
border-radius: 24px!important;
}
.button-square-round a {
border-radius: 4px;
}
.github a:hover {background: #191919; color: #fff;}
.youtube a:hover {background: #c4302b; color: #fff;}
.google-pluse a:hover {background: #DD4B39; color: #fff;}
.twitter a:hover {background: #00acee; color: #fff;}
.instagram a:hover {background: #3f729b; color: #fff;}
.facebook a:hover {background: #3b5998; color: #fff;}
.skype a:hover {background: #00aff0; color: #fff;}
.vk a:hover {background: #5d84ae; color: #fff;}
.odnoklassniki a:hover {background: #f93; color: #fff;}
.pinterest a:hover {background: #c8232c; color: #fff;}
.linkedin a:hover {background: #0e76a8; color: #fff;}
.telegram a:hover {background: #249bd7; color: #fff;}
.tumblr a:hover {background: #34526f; color: #fff;}
.windows a:hover {background: #125acd; color: #fff;}
.whatsapp a:hover {background: #50b154; color: #fff;}
.weibo a:hover {background: #d52b2b; color: #fff;}
.dropbox a:hover {background: #1087dd; color: #fff;}
.viber a:hover{background:#7b519d!important;color:#fff;}
</style>
HTML
<div class="social github">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-github fa-2x"></i></a>
</div>
<div class="social youtube">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-youtube fa-2x"></i></a>
</div>
<div class="social google-pluse">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-google-plus fa-2x"></i></a>
</div>
<div class="social twitter">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-twitter fa-2x"></i></a>
</div>
<div class="social instagram">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-instagram fa-2x"></i></a>
</div>
<div class="social facebook">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-facebook fa-2x"></i></a>
</div>
<div class="social skype">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-skype fa-2x"></i></a>
</div>
<div class="social vk">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-vk fa-2x"></i></a>
</div>
<div class="social odnoklassniki">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-odnoklassniki fa-2x"></i></a>
</div>
<div class="social pinterest">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-pinterest fa-2x"></i></a>
</div>
<div class="social linkedin">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-linkedin fa-2x"></i></a>
</div>
<div class="social telegram">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-paper-plane fa-2x"></i></a>
</div>
<div class="social tumblr">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-tumblr fa-2x"></i></a>
</div>
<div class="social windows">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-windows fa-2x"></i></a>
</div>
<div class="social whatsapp">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-whatsapp fa-2x"></i></a>
</div>
<div class="social weibo">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-weibo fa-2x"></i></a>
</div>
<div class="social dropbox">
<a href="#" target="_blank" rel="noopener"><i class="fa fa-dropbox fa-2x"></i></a>
</div>
<div class="social viber" title="Viber">
<a>
<svg role="img" viewBox="0 0 512 512">
<path fill="currentColor" d="M444 49.9C431.3 38.2 379.9.9 265.3.4c0 0-135.1-8.1-200.9 52.3C27.8 89.3 14.9 143 13.5 209.5c-1.4 66.5-3.1 191.1 117 224.9h.1l-.1 51.6s-.8 20.9 13 25.1c16.6 5.2 26.4-10.7 42.3-27.8 8.7-9.4 20.7-23.2 29.8-33.7 82.2 6.9 145.3-8.9 152.5-11.2 16.6-5.4 110.5-17.4 125.7-142 15.8-128.6-7.6-209.8-49.8-246.5zM457.9 287c-12.9 104-89 110.6-103 115.1-6 1.9-61.5 15.7-131.2 11.2 0 0-52 62.7-68.2 79-5.3 5.3-11.1 4.8-11-5.7 0-6.9.4-85.7.4-85.7-.1 0-.1 0 0 0-101.8-28.2-95.8-134.3-94.7-189.8 1.1-55.5 11.6-101 42.6-131.6 55.7-50.5 170.4-43 170.4-43 96.9.4 143.3 29.6 154.1 39.4 35.7 30.6 53.9 103.8 40.6 211.1zm-139-80.8c.4 8.6-12.5 9.2-12.9.6-1.1-22-11.4-32.7-32.6-33.9-8.6-.5-7.8-13.4.7-12.9 27.9 1.5 43.4 17.5 44.8 46.2zm20.3 11.3c1-42.4-25.5-75.6-75.8-79.3-8.5-.6-7.6-13.5.9-12.9 58 4.2 88.9 44.1 87.8 92.5-.1 8.6-13.1 8.2-12.9-.3zm47 13.4c.1 8.6-12.9 8.7-12.9.1-.6-81.5-54.9-125.9-120.8-126.4-8.5-.1-8.5-12.9 0-12.9 73.7.5 133 51.4 133.7 139.2zM374.9 329v.2c-10.8 19-31 40-51.8 33.3l-.2-.3c-21.1-5.9-70.8-31.5-102.2-56.5-16.2-12.8-31-27.9-42.4-42.4-10.3-12.9-20.7-28.2-30.8-46.6-21.3-38.5-26-55.7-26-55.7-6.7-20.8 14.2-41 33.3-51.8h.2c9.2-4.8 18-3.2 23.9 3.9 0 0 12.4 14.8 17.7 22.1 5 6.8 11.7 17.7 15.2 23.8 6.1 10.9 2.3 22-3.7 26.6l-12 9.6c-6.1 4.9-5.3 14-5.3 14s17.8 67.3 84.3 84.3c0 0 9.1.8 14-5.3l9.6-12c4.6-6 15.7-9.8 26.6-3.7 14.7 8.3 33.4 21.2 45.8 32.9 7 5.7 8.6 14.4 3.8 23.6z"></path>
</svg>
</a>
</div>
Как добавить социальные кнопки на сайт? – https://itchief.ru/javascript/social-buttons
Генератор кнопок соцсетей – https://v3c.ru/instrumenty/gs-button