* {
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  overflow: hidden;
}

.background {
  background: url('https://images.unsplash.com/photo-1541562232579-512a21360020?q=80&w=687&auto=format&fit=crop')
    no-repeat center center / cover;
  position: absolute;
  inset: -20px;
  z-index: -1;
  filter: blur(20px);
  transition: filter 0.2s ease;
}

.strength-bar {
  width: 0%;
  transition: width 0.3s ease;
}