styles.css

body {
  margin: 0 auto;
  background-color: #333;
  max-width: 300px;
  font-family: Roboto;
  color: white;
}
canvas {
  margin-top: 20px;
  cursor: crosshair;
}
label {
  display: block !important;
  height: 28px !important;
}
body.connected #step1 {
  display: none;
}
#step1 {
  display: inherit;
}
body #step2 {
  display: none;
}
body.connected #step2 {
  display: inherit;
}
body.connecting #loading {
  display: block;
  text-align: center;
  padding-top: 24px;
}
#title {
  font-family: Roboto;
  color: rgb(255, 255, 255);
  font-size: 24px;
  letter-spacing: -.02em;
  text-align: center;
  width: 100%;
  padding: 12px 0;
  padding-top: 340px;
}
#loading {
  display: none;
}
#deviceName {
  font-family: Roboto;
  background: transparent;
  border: 0;
  color: rgb(255, 255, 255);
  font-size: 24px;
  letter-spacing: -.02em;
  text-align: center;
  width: 100%;
  outline: none;
  margin: 12px 0;
}
#batteryLevel {
  background-color: #222222;
  margin: 12px 0;
  padding: 12px;
  color: rgb(169, 169, 169);
  border-radius: 4px;
}
#batteryLevel::before {
  content: 'Battery: ';
}
#connect {
  color: white;
  background-color: #4CAF50;
  width: 100%;
  font-weight: bold;
}
#buttons {
  background-color: #222222;
  margin: 0 0 12px 0;
  padding: 12px;
  border-radius: 4px;
  letter-spacing: -0.02em;
}