body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #111;
  color: #fff;
  padding-top: 40px;
}

.wheel-container {
  position: relative;
  margin: 0 auto;
  width: 400px;
  height: 400px;
}

.pointer {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-bottom: 30px solid red;
  z-index: 10;
}

button {
  margin-top: 30px;
  padding: 10px 20px;
  font-size: 18px;
  cursor: pointer;
}

.result {
  margin-top: 20px;
  font-size: 24px;
}