#app {
    font-family: Avenir, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  html,
  body {
    margin: 0;
    padding: 0;
    background: #f7f7f7;
    box-sizing: border-box;
  }
  div,
  span,
  ul,
  li {
    box-sizing: border-box;
  }