#link-instagram .fa-circle {
background: radial-gradient(circle farthest-corner at 35% 90%, #fec564, transparent 50%), radial-gradient(circle farthest-corner at 0 140%, #fec564, transparent 50%), radial-gradient(ellipse farthest-corner at 0 -25%, #5258cf, transparent 50%), radial-gradient(ellipse farthest-corner at 20% -50%, #5258cf, transparent 50%), radial-gradient(ellipse farthest-corner at 100% 0, #893dc2, transparent 50%), radial-gradient(ellipse farthest-corner at 60% -20%, #893dc2, transparent 50%), radial-gradient(ellipse farthest-corner at 100% 100%, #d9317a, transparent), linear-gradient(#6559ca, #bc318f 30%, #e33f5f 50%, #f77638 70%, #fec66d 100%);
-webkit-background-clip: text;
background-clip: text;
color: transparent;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.11.2/css/all.css" rel="stylesheet" />
<li id="link-instagram" class="list-inline-item">
<a href="#">
<span class="fa-stack fa-lg">
<i class="fas fa-circle fa-stack-2x"></i>
<i class="fab fa-instagram fa-stack-1x fa-inverse"></i>
</span>
</a>
</li>
You say in the icon ?
– Gato de Schrödinger
Not in the background circle...
– Everton Dias