* {
  user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
  -moz-user-select: none;
}

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

.lock-screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  text-align: center;
  padding: 20px;
}

#passwordDots span {
  display: inline-block;
  width: 20px;
  margin: 5px;
  font-size: 2rem;
  border-bottom: 2px solid white;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 60px);
  grid-gap: 10px;
  margin-top: 20px;
}

.keypad button,
.main-content button {
  font-size: 1.5rem;
  padding: 15px;
  background-color: #222;
  color: white;
  border: 1px solid #555;
  border-radius: 10px;
  cursor: pointer;
  outline: none;
}

.keypad button:active,
.main-content button:active {
  background-color: #444;
}

#mainContent {
  padding: 20px;
  text-align: center;
}

.back-link {
  color: white;
  text-decoration: underline;
  font-size: 1.2rem;
  display: inline-block;
  margin-top: 15px;
}
.back-link:active {
  opacity: 0.6;
}