#app {
  font-family: "Rubik", serif;
  font-optical-sizing: auto;
  font-weight: 600;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  background-color:  grey;
}
body {
  margin: 0px
}