Css conflict between suite 7 version and vault 4 version

<link rel="stylesheet" type="text/css" th:href="@{/js/dhtmlxSuite/codebase/suite.css}" />
<link rel="stylesheet" type="text/css" th:href="@{/js/dhtmlxSuite/codebase/vault.css}" />

If you declare css in the suite 7.2.0 version and css in the vault 4.0.0 version together, the application of css is strange.
The scroll bar of the grid is automatically thinned, or when the datapicker is entered in the form widget, the position where the calendar is displayed becomes strange or the width information is automatically changed.
How to deal with this phenomenon?
Is it not possible to apply css to suite 7.2.0 and css to vault 4.0.0 together?