<svg version="1.1" x="0" y="0" width="150px" height="150px" viewBox="-10 -10 120 120" enable-background="new 0 0 200 200" xml:space="preserve">
   <path 
         class="circle"
         d="M0,50 A50,50,0 1 1 100,50 A50,50,0 1 1 0,50"
   />
</svg>

body {
    background: #E1E1E1;
    text-align: center;
}

svg{
    width: 200px;
    height: 200px;
    display:inline-block;
    padding:0px;
    transform:rotate(90deg);
    -webkit-transform:rotate(90deg);
}

.circle {
    fill: transparent;
    stroke: #55acee;
    stroke-width:3px;
    -webkit-animation: 1.5s circle infinite ease-in;
    animation: 1.5s circle infinite ease-in;
}

@keyframes circle {
  0% {
    stroke-dasharray:0 400;
    stroke-dashoffset: 0;
  }
  25%{
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dasharray:400 400;
    stroke-dashoffset: -400;
  }
}

@-webkit-keyframes circle {
  0% {
    stroke-dasharray:0 400;
    stroke-dashoffset: 0;
  }
  25%{
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dasharray:400 400;
    stroke-dashoffset: -400;
  }
}