.messagebox-modal-size {
    background: #fefefe;
    border: #333 solid 1px;
    border-radius: 5px;
    position: fixed;
    left: 40%;
    top: 40%;
    width: 20%;
    z-index: 999;
}

.messagebox-modal-header {
    border-bottom: #eee solid 1px;
}

.messagebox-modal-lbl-header {
    font-size: 20px;
}

.messagebox-modal-body {
    padding: 20px;
}