#thankyou-popup{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.7);z-index:9999}#thankyou-popup .content{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;padding:30px;border-radius:8px;text-align:center;max-width:400px;width:90%}#thankyou-popup .close-btn{margin-top:15px;padding:8px 16px;background:#0073aa;color:#fff;border:none;border-radius:4px;cursor:pointer}