/** https://developers.facebook.com/docs/facebook-login/best-practices#buttondesign **/
#facebook_btn {
    background: #3b5998 url("/images/SocialConnection/facebook_signin_buttons/FB-f-Logo__white_29.png") no-repeat center;
    display: inline-block;
    border: none;
    height: 37px;
    padding: 0 12px 0 38px;
    color: white;
    font-size: 14px;
    line-height: 36px;
    border-radius: 3px;
    cursor: pointer;
}