html, body{
    height:100%; /* important to vertically align the container */
    margin:0;
    padding:0;
}

.centered {
    position: fixed;
    top: 40%;
    left: 50%;
    /* bring your own prefixes */
    transform: translate(-50%, -50%);
}

a.tgme_action_button,
a.tgme_action_button_new {
    font-size: 14px;
    font-weight: bold;
    line-height: 100%;
    color: #FFF;
    background: #5dc390;
    border-radius: 22px;
    white-space: nowrap;
    overflow: hidden;
    display: inline-block;
    padding: 15px 27px 13px;
    text-transform: uppercase;
}
a.tgme_action_button:hover,
a.tgme_action_button:active,
a.tgme_action_button_new:hover,
a.tgme_action_button_new:active {
    color: #FFF;
    background: #4bbc87;
    text-decoration: none;
}
a.tgme_action_button_new {
    background: #33d684;
}
a.tgme_action_button_new:hover,
a.tgme_action_button_new:active {
    background: #28c979;
}