body {
  text-align: center;
  min-height: 100vh;
  background: #1a1a1a;
  margin: 0;
  padding: 20px;
  font-family: "Arial", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

h1 {
  color: #fff;
  font-size: 3.5rem;
  margin-bottom: 10px;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
  letter-spacing: 3px;
  font-weight: bold;
}

h2 {
  color: #ffd700;
  font-size: 1.5rem;
  margin-bottom: 30px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.btn-container {
  background: #333;
  border-radius: 50%;
  padding: 20px;
  position: relative;
  width: 500px;
  height: 500px;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5), inset 0 0 30px rgba(0, 0, 0, 0.5);
  border: 15px solid #222;
}

.line-one,
.line-two {
  position: absolute;
  display: flex;
  gap: 10px;
}

.line-one {
  margin-bottom: 250px;
}

.line-two {
  margin-top: 250px;
}

.btn {
  height: 200px;
  width: 200px;
  border: 8px solid #000;
  margin: 5px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
}

.btn::after {
  content: attr(id);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  color: rgba(0, 0, 0, 0.5);
  font-weight: bold;
}

.yellow {
  background-color: #f99b45;
  border-top-right-radius: 100%;
}

.red {
  background-color: #d95980;
  border-top-left-radius: 100%;
}

.purple {
  background-color: #819ff9;
  border-bottom-right-radius: 100%;
}

.green {
  background-color: #63aac0;
  border-bottom-left-radius: 100%;
}

.btn:hover {
  filter: brightness(1.2);
}

.btn:active {
  transform: scale(0.95);
}

.flash {
  background-color: white !important;
  border-color: white;
  box-shadow: 0 0 20px white;
}

.userflash {
  filter: brightness(1.5);
  box-shadow: 0 0 30px currentColor;
}

@media (max-width: 900px) {
  .btn-container {
    width: 400px;
    height: 400px;
  }

  .btn {
    height: 150px;
    width: 150px;
  }

  .line-one {
    margin-bottom: 200px;
  }

  .line-two {
    margin-top: 200px;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 1.2rem;
  }
}

@media (max-width: 500px) {
  .btn-container {
    width: 300px;
    height: 300px;
    border-width: 10px;
  }

  .btn {
    height: 120px;
    width: 120px;
    border-width: 6px;
  }

  .line-one {
    margin-bottom: 150px;
  }

  .line-two {
    margin-top: 150px;
  }

  .btn::after {
    font-size: 1.5rem;
  }
}