There is a possibility to make changes in the look and feel of a message box or a tooltip. You can either create a new CSS class or use a CSS class that DHTMLX library provides.

Using new CSS classes

To use a new CSS class you need to take the following steps:

  • add a new CSS class(es) with desired settings in the < style > section of your HTML page or in your file with styles (don't forget to include your file on the page in this case)
    .my_first_class {
        /*some styles*/
    .my_second_class {
        /*some styles*/
  • specify the name of the created CSS class (or names of classes separated by spaces) as the value of the css property in the message box/tooltip configuration:
    css:"my_first_class my_second_class"

Related sample:  Message custom styles - DHTMLX Message

Using default CSS classes

The DHTMLX library provides a set of CSS classes that you can apply to change appearance of a message box or a tooltip.


List of CSS classes

  • dhx_widget--bg_white - Sets white background to a widget

  • dhx_widget--bg_gray - Sets gray background to a widget

  • dhx_widget--bordered - Sets borders on all sides of a widget

  • dhx_widget--border_top - Sets a border on the top side of a widget

  • dhx_widget--border_bottom - Sets a border on the bottom side of a widget

  • dhx_widget--border_left - Sets a border on the left side of a widget

  • dhx_widget--border_right - Sets a border on the right side of a widget

  • dhx_widget--border-shadow - Adds a shadow border to a widget

  • dhx_widget--no-border_top - Removes the top border of a widget

  • dhx_widget--no-border_bottom - Removes the bottom border of a widget

  • dhx_widget--no-border_right - Removes the right border of a widget

  • dhx_widget--no-border_left - Removes the left border of a widget

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