Add tailwind dependency

package.json

@@ -6,7 +6,6 @@
   "homepage": "https://hypothes.is",
   "bugs": "https://github.com/hypothesis/client/issues",
   "repository": "hypothesis/client",
-  "dependencies": {},
   "devDependencies": {
     "@babel/core": "^7.1.6",
     "@babel/preset-env": "^7.1.6",
@@ -85,6 +84,7 @@
     "shallowequal": "^1.1.0",
     "showdown": "^1.6.4",
     "sinon": "^12.0.1",
+    "tailwindcss": "^2.2.19",
     "tiny-emitter": "^2.0.2",
     "typescript": "^4.0.2",
     "wrap-text": "^1.0.7"