CSS

css circle border

.circle {
    background-color:#fff;
    border:1px solid red;    
    height:100px;
    border-radius:50%;
    -moz-border-radius:50%;
    -webkit-border-radius:50%;
    width:100px;
}
<div class="circle"></div>

create circle border css

#div2{
    width: 150px;
    height: 150px;
    border: 3px solid #05ffb0;
    border-radius: 50%;
    padding: 20px;
    text-align: center;
}