SOURCE

<div class="CircleBadge CircleBadge--small CircleBadge--github" style="background-color: #ffffff;">
  <img class="CircleBadge-icon" alt="Zube" src="https://avatars1.githubusercontent.com/ml/1973?s=106&v=4">
</div>

    .CircleBadge--github {
      position: relative;
    }
    
    .CircleBadge--small {
      height: 100px;
      width: 100px;
    }
    
    .CircleBadge {
      align-items: center;
      background-color: #fff;
      border-radius: 50%;
      box-shadow: 0 1px 5px rgba(27, 31, 35, .15);
      display: flex;
      justify-content: center;
    }
    
    .CircleBadge-icon {
      height: auto !important;
      max-height: 55% !important;
      max-width: 60% !important;
    }
    
    img {
      border-style: none;
    }
    
    .CircleBadge--github:after {
      background: #fff url("data:image/svg+xml;base64,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") 50% no-repeat;
      border-radius: 100px;
      bottom: 0;
      content: "";
      display: block;
      height: 22px;
      line-height: 0;
      padding: 3px;
      position: absolute;
      right: 0;
      width: 22px;
    }