help icon using css code example

Example: css help icon

<style>
.help_icon{
    width:16px;
    height:16px;
    line-height:16px;
    text-align:center;
    display:inline-block;
    border-radius:100%;
    font-size:14px;
    text-decoration:none;
    -webkit-box-shadow: inset -1px -1px 1px 0px rgba(0,0,0,0.4);
    -moz-box-shadow: inset -1px -1px 1px 0px rgba(0,0,0,0.4);
    box-shadow: inset -1px -1px 1px 0px rgba(0,0,0,0.4);
    color:#000;
    background-color:#f2cd5c;
}
</style>
<a class="help_icon">?</a>