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HTML

              
                .charger
              
            
!

CSS

              
                *
  box-sizing border-box

:root
  --bg hsl(0, 10%, 10%)

body
  min-height 100vh
  background var(--bg)
  display grid
  place-items center

@property --a
  initial-value 0deg
  inherits false
  syntax '<angle>'
@property --h
  initial-value 0
  inherits false
  syntax '<number>'
@property --c
  initial-value 0
  inherits false
  syntax '<integer>'

.charger
  height 40vmin
  width 40vmin
  font-family monospace
  font-weight bold
  color hsl(0, 0%, 100%)
  font-size 2rem
  border-radius 50%
  position relative
  display grid
  place-items center
  background hsl(0, 0%, 25%)
  counter-reset charge var(--c)
  animation charge 60s forwards steps(100)
  
  &:after
    content counter(charge) '%'
    position absolute
    top 50%
    left 50%
    font-size 10vmin
    transform translate(-50%, -50%)
  
  &:before
    --charge 'hsl(%s, 80%, 50%)' % var(--h, 0)
    animation load 2s 30 ease-in-out forwards, loaded 1s 60s infinite linear
    content ''
    position absolute
    top -2vmin
    right -2vmin
    left -2vmin
    bottom -2vmin
    background conic-gradient(var(--charge) var(--a), transparent calc(var(--a) + 0.5deg))
    border-radius 50%
    z-index -1

@keyframes load
  0%, 10%
    --a 0deg
    --h 0
  100%
    --a 360deg
    --h 100
    
@keyframes loaded
  to
    --h 360

@keyframes charge
  to
    --c 100
              
            
!

JS

              
                
              
            
!
999px

Console