* {
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #121212;
  color: #fff;
  display: flex;
  justify-content: center;
  padding: 40px;
}

.container {
  width: 420px;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

.card {
  background: #1e1e1e;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
}

input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  background: #2b2b2b;
  border: none;
  color: #fff;
  border-radius: 4px;
}

.meter {
  height: 8px;
  background: #333;
  border-radius: 4px;
  margin-top: 10px;
}

#strengthBar {
  height: 100%;
  width: 0;
  border-radius: 4px;
}

button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  background: #4caf50;
  border: none;
  color: #fff;
  cursor: pointer;
  border-radius: 4px;
}

button:hover {
  opacity: 0.9;
}

.options label {
  display: block;
  margin-top: 5px;
}

ul {
  margin-top: 10px;
  padding-left: 18px;
  font-size: 14px;
}