library_books<style>
  @keyframes blinkLight{
    0%,100%{border-color:white}
    25%{border-color:blue}
    50%{border-color:yellow}
    75%{border-color:red}
  }
  #box {
    width:80px;height:80px;
    margin:60px auto;
    border:8px dotted white;
    border-radius:50% 50% 0 0;
    padding:4px;
    background:black;
    animation:blinkLight 2s linear infinite;
  }
  #circle{
    border-radius:inherit;
    background-color:white;
    height:100%
  }
 </style>
 <div id="box">
    <div id="circle"></div>
 </div>

library_books<style>
  @keyframes blinkLight{
    0%,100%{border-color:white}
    25%{border-color:blue}
    50%{border-color:yellow}
    75%{border-color:red}
  }
  #box {
    width:80px;height:80px;
    margin:60px auto;
    border:8px dotted white;
    border-radius:50% 50% 0 0;
    padding:4px;
    background:black;
    animation:blinkLight 2s linear infinite;
  }
  #circle{
    border-radius:50%;
    background-color:white;
    height:100%
  }
 </style>
 <div id="box">
    <div id="circle"></div>
 </div>