I get an error when importing css from npm packages

I’ve followed the official guide for importing css and always get this error when building. The example error below is when importing medium-draft css but I get it with pretty much any css import.

W20161023-22:05:27.592(-4)? (STDERR) /Users/mattmacpherson/Documents/Websites/project/node_modules/medium-draft/lib/index.css:6
W20161023-22:05:27.592(-4)? (STDERR) .DraftEditor-editorContainer,.DraftEditor-root,.public-DraftEditor-content{height:inherit;text-align:initial}.public-DraftEditor-content[contenteditable=true]{-webkit-user-modify:read-write-plaintext-only}.DraftEditor-root{position:relative}.DraftEditor-editorContainer{background-color:hsla(0,0%,100%,0);border-left:.1px solid transparent;position:relative;z-index:1}.public-DraftEditor-block{position:relative}.DraftEditor-alignLeft .public-DraftStyleDefault-block{text-align:left}.DraftEditor-alignLeft .public-DraftEditorPlaceholder-root{left:0;text-align:left}.DraftEditor-alignCenter .public-DraftStyleDefault-block{text-align:center}.DraftEditor-alignCenter .public-DraftEditorPlaceholder-root{margin:0 auto;text-align:center;width:100%}.DraftEditor-alignRight .public-DraftStyleDefault-block{text-align:right}.DraftEditor-alignRight .public-DraftEditorPlaceholder-root{right:0;text-align:right}.public-DraftEditorPlaceholder
W20161023-22:05:27.592(-4)? (STDERR)          
W20161023-22:05:27.592(-4)? (STDERR) SyntaxError: Unexpected token .
W20161023-22:05:27.593(-4)? (STDERR)     at exports.runInThisContext (vm.js:53:16)
W20161023-22:05:27.593(-4)? (STDERR)     at Module._compile (module.js:373:25)
W20161023-22:05:27.593(-4)? (STDERR)     at Object.Module._extensions..js (module.js:416:10)
W20161023-22:05:27.593(-4)? (STDERR)     at Module.load (module.js:343:32)
W20161023-22:05:27.594(-4)? (STDERR)     at Module.Mp.load (/Users/mattmacpherson/.meteor/packages/babel-compiler/.6.9.1_1.15j1r1l++os+web.browser+web.cordova/npm/node_modules/reify/node/runtime.js:16:23)
W20161023-22:05:27.594(-4)? (STDERR)     at Function.Module._load (module.js:300:12)
W20161023-22:05:27.594(-4)? (STDERR)     at Module.require (module.js:353:17)
W20161023-22:05:27.594(-4)? (STDERR)     at require (internal/module.js:12:17)
W20161023-22:05:27.595(-4)? (STDERR)     at npmRequire (/Users/mattmacpherson/Documents/Websites/project/.meteor/local/build/programs/server/npm-require.js:129:10)
W20161023-22:05:27.595(-4)? (STDERR)     at Module.Mp.useNode (packages/modules-runtime/modules-runtime.js:69:1)