Vuetify renders markup with an error, how to fix it?

Question

Vue.js

I installed Vuetify version 2.07 and copied the ready-made markup from the 2.07 documentation (from here https://vuetifyjs.com/examples/layouts/complex)
But the button is not displayed correctly, screen:

Code from packed:

{
  "name": "virilis",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "core-js": "^2.6.5",
    "vue": "^2.6.10",
    "vue-router": "^3.0.3",
    "vuetify": "^2.0.7"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "^3.10.0",
    "@vue/cli-plugin-eslint": "^3.10.0",
    "@vue/cli-service": "^3.10.0",
    "babel-eslint": "^10.0.1",
    "eslint": "^5.16.0",
    "eslint-plugin-vue": "^5.0.0",
    "sass": "^1.17.4",
    "sass-loader": "^7.1.0",
    "vue-cli-plugin-vuetify": "^0.6.3",
    "vue-template-compiler": "^2.6.10",
    "vuetify-loader": "^1.2.2"
  },
  "eslintConfig": {
    "root": true,
    "env": {
      "node": true
    },
    "extends": [
      "plugin:vue/essential",
      "eslint:recommended"
    ],
    "rules": {},
    "parserOptions": {
      "parser": "babel-eslint"
    }
  },
  "postcss": {
    "plugins": {
      "autoprefixer": {}
    }
  },
  "browserslist": [
    "> 1%",
    "last 2 versions"
  ]
}

Answer 1

Problem with icon fonts. Check that you are inserting the correct icons.