style.css

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Times New Roman", Times, serif;
  background-color: lightgrey;
}

.app {
  border: 5px solid rgb(85, 160, 0);
  padding: 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  font-weight: bold;
  background-color: white;
  user-select: none;
}

.buttons-container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  font-size: 1.5rem;
}

.sound-button {
  text-align: center;
  border: 1px solid black;
  border-radius: 5px;
  box-shadow: 0 0 5px 2px gray;
  padding: 30px;
  cursor: pointer;
  user-select: none;
  background-color: rgb(185, 220, 231);
  font-weight: bold;
}

.sound-button:active {
  transform: scale(0.95);
  background-color: rgb(132, 195, 214);
}

.sound-button.power-off:active {
  transform: scale(0.95);
  background-color: rgb(185, 220, 231);
}

.control-panel {
  display: flex;
  text-align: center;
  flex-direction: column;
  align-items: center;
  justify-content: space-evenly;
}

.control-panel {
  font-size: 1.5rem;
}

.switch {
  transform: scale(1.5);
}

.switch label {
  color: black;
}

.switch label input[type="checkbox"]:checked + .lever {
  background-color: green;
}

.switch label input[type="checkbox"]:checked + .lever:after {
  background-color: rgb(0, 151, 0);
}

.display {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 200px;
  height: 80px;
  padding: 20px;
  background-color: lightgreen;
}

@keyframes fadeMessage {
  to {
    width: 0;
    height: 0;
    overflow: hidden;
  }
}

input[type="range"] {
  width: 200px;
  -webkit-appearance: none;
  background-color: #9a905d;
}

input[type="range"]::-webkit-slider-thumb {
  background-color: rgb(0, 151, 0);
}

input[type="range"]:disabled::-webkit-slider-thumb {
  background-color: gray;
}