CSS

transparent circle in a div

div{
    position:relative;
    width:500px; height:200px;
    margin:0 auto;
    overflow:hidden;
}
div:after{
    content:'';
    position:absolute;
    left:175px; top:25px;
    border-radius:100%;
    width:150px; height:150px;
    box-shadow: 0px 0px 0px 2000px #E3DFD2;
}

body{background: url('https://farm9.staticflickr.com/8760/17195790401_ceeeafcddb_o.jpg');background-size:cover;}

transparent circle css

.carousel-indicators > li {
    border-radius: 50%;
    width: 12px;
    height: 12px;
    border:2px solid white;
    background:white;
    color:white;
  }