body {  
  font-family: "Open Sans", sans-serif;
  background:#eee;
}

.fixed-width-font {
  font-family:monospace;
}

.display, .c1 {
  font-size: 1.5rem;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-weight:400;
}

.card-header {
  text-align:center;
}

.card-body {
  margin-top:0;
  padding-top:8px;
  padding-bottom:12px;
}