body {
  font-family: sans-serif;
  text-align: center;
  background: #f0f2f5;
  margin: 0;
  padding: 0;
}

.container {
  margin-top: 40px;
}

.wheel-container {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}

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

#spinBtn {
  margin-top: 30px;
  padding: 10px 25px;
  font-size: 18px;
  background-color: #28a745;
  border: none;
  border-radius: 8px;
  color: white;
  cursor: pointer;
  transition: background 0.3s;
}

#spinBtn:disabled {
  background: gray;
  cursor: not-allowed;
}

#result {
  margin-top: 20px;
  font-size: 20px;
  font-weight: bold;
}