html, body {
  margin: 0;
  padding: 0;
  background-color: black;
  height: 100%;
  width: 100%;
  font-family: Arial, sans-serif;
  color: white;
}

#reaction-test-box {
  width: 100vw;
  height: 100vh;
  background-color: #007bff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  transition: background-color 0.3s ease-in-out;
  padding: 20px;
  box-sizing: border-box;
}

#reaction-test-box-text {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 30px;
  max-width: 90%;
}

.reaction-btn {
  padding: 12px 20px;
  margin: 10px;
  font-size: 16px;
  font-weight: bold;
  color: white;
  background-color: #64d17f;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 6px #258a3e;
  width: 200px;
}

.reaction-btn:active {
  background-color: #4fa75e;
  box-shadow: 0 3px #1c6b2e;
  transform: translateY(3px);
}

#reaction-test-result {
    font-size: 26px;
    font-weight: 800;
  }
#reaction-test-average,
#reaction-test-attempts {
  font-size: 16px;
  margin: 5px 0;
  color: white;
}

@media (max-width: 600px) {
  .reaction-btn {
    width: 90%;
    font-size: 18px;
    margin: 8px 0;
  }

  #reaction-test-box-text {
    font-size: 22px;
  }

  #reaction-test-result {
    font-size: 26px;
    font-weight: 800;
  }
  #reaction-test-average,
  #reaction-test-attempts {
    font-size: 18px;
  }
}
/* --------------------------------------*/