Wrok on static/tree

IPython/frontend/html/notebook/static/tree/less/style.less

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+@import "../../base/less/base.less";
+@import "variables.less";
+@import "altuploadform.less";
+@import "tree.less";
  No newline at end of file

IPython/frontend/html/notebook/static/tree/less/variables.less

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+// Bootstrap customizations specific to this page.

IPython/frontend/html/notebook/static/auth/less/variables.less

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+// Bootstrap customizations specific to this page.