CSS

linear gradient instagram

background: #f09433; 
background: -moz-linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%); 
background: -webkit-linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%); 
background: linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%); 
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f09433', endColorstr='#bc1888',GradientType=1 );

instagram gradient css

<style>
.insta-icon {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 20%;
  background: radial-gradient(circle at 33% 100%, #fed373 4%, #f15245 30%, #d92e7f 62%, #9b36b7 85%, #515ecf)
}
.insta-icon:after,
.insta-icon:before {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 25px;
  height: 25px;
  border: 2px solid #fff;
  transform: translate(-50%, -50%);
  content: ''
}
.insta-icon:before {
  border-radius: 20%
}
.insta-icon:after {
  width: 11px;
  height: 11px;
  border-radius: 50%
}
</style>
<div class="insta-icon"></div>