Set tinymce config: "style_formats".
Add "STYLE_FORMATS" to TinyMCESettings.py
Reference:
    http://www.tinymce.com/tryit/html5_formats.php
    http://www.tinymce.com/tryit/custom_formats.php
    http://www.tinymce.com/wiki.php/Configuration:formats
STYLE_FORMATS = [{
    'title' : 'Template styles'
}, {
    'title' : _('InvitationCard-table'),
    'selector' : 'table',
    'styles' : {
        'width': '621px',
        'font-weight': '400',
        'font-family': 'Microsoft YaHei,新細明體',
        'font-size': '12px',
        'line-height': '25px',
        'marginTop': '10px',
        'marginRight': '39px',
    },
    'attributes': {
        'cellspacing': '0',
        'cellpadding': '0',
    }
}, {
    'title' : _('InvitationCard-table-th'),
    'selector' : 'td',
    'styles' : {
        'backgroundColor': '#94B623',
        'height': '25px',
        'letter-spacing': '10px',
        'color': '#ffffff',
        'font-weight': '700',
        'text-align': 'center',
    }
}, {
    'title' : _('InvitationCard-table-tr>blue'),
    'selector' : 'td',
    'styles' : {
        'backgroundColor': '#E9F3F5',
        'border-bottom': '1px',
        'padding-left': '10px',
        'color': '#0A5D93',
    }
}]
