Pinterest Follow Button center alignment

How to center the Pinterest Follow Me button? I have read the support forum on this but I am still having difficulty.
Don’t know if I should add a code or change something. Help would be appreciated.

/* Pinterest "Follow" Button Public CSS */

/* DIV surrounding button */
.pinterest-follow-btn-wrapper-shortcode,
.pinterest-follow-btn-wrapper-widget {

}

.pinterest-follow-btn-wrapper-shortcode img {
    border: 0;
    padding: 0;
    margin: 0;
    background: none;
}

/* Latest "clear fix" method: http://css-tricks.com/snippets/css/clear-fix/ */
.pfb-clearfix:before,
.pfb-clearfix:after {
    content:"";
    display:table;
}
.pfb-clearfix:after {
    clear:both;
}
.pfb-clearfix {
    zoom:1; /* For IE 6/7 (trigger hasLayout) */
}

.pfb-float-left {
    float: left;
}

.pfb-float-right {
    float: right;
}