#app {
  font-family: "Avenir", Helvetica, Arial, sans-serif, PingFang SC;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  height: 100%;
}
html,
body {
  height: 100%;
  margin: 0;
  -moz-user-select: none;
   -ms-user-select: none;
       user-select: none;
}
li {
  list-style: none;
}