src/index.css

/* Global styles for embedding */
html, body, #root {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f5f5;
}