body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #121212;
  color: #ffffff;
  text-align: center;
  padding: 30px;
  margin: 0;
}

h2 {
  color: #ffffff;
  margin-bottom: 20px;
  font-size: 26px;
}

#output {
  font-size: 24px;
  font-weight: bold;
  color: #00eaff;
  background-color: #1e1e1e;
  padding: 15px 25px;
  margin: 20px auto;
  border-radius: 15px;
  box-shadow: 0 4px 12px rgba(0, 255, 255, 0.1);
  width: fit-content;
}

.keyboard {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  max-width: 700px;
  margin: 30px auto;
  background-color: #1c1c1c;
  padding: 30px;
  border-radius: 25px;
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.08);
}

.keyboard button {
  width: 60px;
  height: 60px;
  font-size: 22px;
  font-weight: bold;
  background-color: #282828;
  color: #ffffff;
  border: 2px solid #444;
  border-radius: 50%;
  cursor: pointer;
  transition: 0.2s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

.keyboard button:hover {
  background-color: #00eaff;
  color: #121212;
  border-color: #00eaff;
  transform: scale(1.1);
}