.password-strength-bar {
  height: 6px;
  margin-top: 5px;
  border-radius: 3px;
  background: #ccc;
  transition: all 0.3s ease;
}
.password-strength-bar.fraca {
  width: 33%;
  background: red;
}
.password-strength-bar.media {
  width: 66%;
  background: orange;
}
.password-strength-bar.forte {
  width: 100%;
  background: green;
}