/*****************
 * column-header *
 *****************/
column-header.button,
column-header.button:active,
column-header .button,
column-header .button:active {
    font-weight: bold;
    border-width: 0;
    border-radius: 0;
}
column-header.button,
column-header.button:active,
column-header.button:focus,
column-header.button:active:focus,
column-header .button,
column-header .button:active,
column-header .button:focus,
column-header .button:active:focus {
    box-shadow: none;
    background-color: inherit;
    background-image: none;
}
column-header.button:hover,
column-header.button:active:hover,
column-header.button:hover:focus,
column-header.button:active:hover:focus,
column-header .button:hover,
column-header .button:active:hover,
column-header .button:hover:focus,
column-header .button:active:hover:focus {
    box-shadow: none;
    background-color: inherit;
    background-image: none;
}
column-header:last-child.button,
column-header:last-child .button {

}
column-header.button,
column-header .button,
column-header.button:focus,
column-header .button:focus {
    background-color: @tooltip_bg_color;
    color: shade(@text_color, 1.1);
}
column-header.button:active,
column-header .button:active,
column-header.button:active:focus,
column-header .button:active:focus {
    background-color: @tooltip_bg_color;
}