chore: downgrade unocss to v0.47.6

In v0.48.x, unocss removed the default `border-style` in `b`, refer to unocss/unocss#1971

package.json

@@ -20,7 +20,7 @@
     "@ctrl/tinycolor": "^3.5.0",
     "@iconify-json/ri": "^1.1.4",
     "@types/node": "^18.11.16",
-    "@unocss/preset-rem-to-px": "^0.48.4",
+    "@unocss/preset-rem-to-px": "^0.47.6",
     "@vitejs/plugin-vue": "^4.0.0",
     "@vueuse/core": "^9.7.0",
     "@vueuse/head": "^1.0.22",
@@ -30,7 +30,7 @@
     "lint-staged": "^13.1.0",
     "simple-git-hooks": "^2.8.1",
     "typescript": "^4.9.3",
-    "unocss": "^0.48.4",
+    "unocss": "^0.47.6",
     "vite": "^4.0.0",
     "vite-ssg": "^0.22.1",
     "vue-tsc": "^1.0.11"