when screen size becomes smaller, then drawer-dropdown-menu-item can't expand.

[chengolina]

when screen size becomes smaller, then drawer-dropdown-menu-item can't expand. all kind of this name items are displayed as blocks without clicking. Other effect is operating well. Is it related to my insert css “bootstrap"or isscroll.js ? Actually I want to use drawer.js as mobile version, but in the computer browser , I can get the effects and modify style. Can you help me solve this problem? Just give some advice.