CSS conflict with WordPress

https://github.com/zTree/zTree_v3/issues/2
about the css : .button & .level

zTree add  className in  ztree.core-3.5. If you want use zTree v3 in
WordPress, please change the name & the css file (zTreeStyle.css) by
your self.

className: {
BUTTON: "button",
LEVEL: "level",
ICO_LOADING: "ico_loading",
SWITCH: "switch"
},