festa/styles/telegram.css

/* Taken from the Telegram widget button */
.btn-telegram {
    display: inline-block;
    vertical-align: top;
    font-weight: 500;
    background-color: #54a9eb;
    text-overflow: ellipsis;
    overflow: hidden;
    margin: 0;
    border: none;
    color: #fff;
    cursor: pointer;

    font-size: 16px;
    line-height: 20px;
    padding: 9px 21px 11px;
    border-radius: 20px;
}

.avatar-telegram {
    width: 40px;
    height: 40px;
    border-radius: 20px;

    margin-left: 4px;
}