create circle border white in css code example

Example 1: make span html circle css

span {
    display: block;
    height: 60px;
    width: 60px;
    line-height: 60px;

    -moz-border-radius: 30px; /* or 50% */
    border-radius: 30px; /* or 50% */

    background-color: black;
    color: white;
    text-align: center;
    font-size: 2em;
}

Example 2: how to make a circle in html

<svg xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="50" r="50" fill="red" />
</svg>