@supports(-webkit-appearance: none) or (-moz-appearance: none) {
  input[type='checkbox'],
  input[type='radio'] {
    --active: #275EFE;
    --active-inner: #fff;
    --focus: 2px rgba(39, 94, 254, .3);
    --border: #BBC1E1;
    --border-hover: #275EFE;
    --background: #fff;
    --disabled: #F6F8FF;
    --disabled-inner: #E1E6F9;
    -webkit-appearance: none;
    -moz-appearance: none;
    height: 21px;
    outline: none;
    display: inline-block;
    vertical-align: top;
    position: relative;
    margin: 0;
    cursor: pointer;
    border: 1px solid var(--bc, var(--border));
    background: var(--b, var(--background));
    transition: background .3s, border-color .3s, box-shadow .2s;
    &:after {
      content: '';
      display: block;
      left: 0;
      top: 0;
      position: absolute;
      transition: transform var(--d-t, .3s) var(--d-t-e, ease), opacity var(--d-o, .2s);
    }
    &:checked {
      --b: var(--active);
      --bc: var(--active);
      --d-o: .3s;
      --d-t: .6s;
      --d-t-e: cubic-bezier(.2, .85, .32, 1.2);
    }
    &:disabled {
      --b: var(--disabled);
      cursor: not-allowed;
      opacity: .9;
      &:checked {
        --b: var(--disabled-inner);
        --bc: var(--border);
      }
      & + label {
        cursor: not-allowed;
      }
    }
    &:hover {
      &:not(:checked) {
        &:not(:disabled) {
          --bc: var(--border-hover);
        }
      }
    }
    &:focus {
      box-shadow: 0 0 0 var(--focus);
    }
    &:not(.switch) {
      width: 21px;
      &:after {
        opacity: var(--o, 0);
      }
      &:checked {
        --o: 1;
      }
    }
    & + label {
      font-size: 14px;
      line-height: 21px;
      display: inline-block;
      vertical-align: top;
      cursor: pointer;
      margin-left: 4px;
    }
  }
  input[type='checkbox'] {
    &:not(.switch) {
      border-radius: 7px;
      &:after {
        width: 5px;
        height: 9px;
        border: 2px solid var(--active-inner);
        border-top: 0;
        border-left: 0;
        left: 7px;
        top: 4px;
        transform: rotate(var(--r, 20deg));
      }
      &:checked {
        --r: 43deg;
      }
    }
    &.switch {
      width: 38px;
      border-radius: 11px;
      &:after {
        left: 2px;
        top: 2px;
        border-radius: 50%;
        width: 15px;
        height: 15px;
        background: var(--ab, var(--border));
        transform: translateX(var(--x, 0));
      }
      &:checked {
        --ab: var(--active-inner);
        --x: 17px;
      }
      &:disabled {
        &:not(:checked) {
          &:after {
            opacity: .6;
          }
        }
      }
    }
  }
  input[type='radio'] {
    border-radius: 50%;
    &:after {
      width: 19px;
      height: 19px;
      border-radius: 50%;
      background: var(--active-inner);
      opacity: 0;
      transform: scale(var(--s, .7));
    }
    &:checked {
      --s: .5;
    }
  }
}

// Demo

ul {
  margin: 12px;
  padding: 0;
  list-style: none;
  width: 100%;
  max-width: 320px;
  li {
    margin: 16px 0;
    position: relative;
  }
}

html {
  box-sizing: border-box;
}

* {
  box-sizing: inherit;
  &:before,
  &:after {
    box-sizing: inherit;
  }
}

// Center & dribbble
body {
  min-height: 100vh;
  font-family: 'Inter', Arial, sans-serif;
  color: #8A91B4;
  display: flex;
  justify-content: center;
}
.grow-wrap {
  /* easy way to plop the elements on top of each other and have them both sized based on the tallest one's height */
  display: grid;
}
.grow-wrap::after {
  /* Note the weird space! Needed to preventy jumpy behavior */
  content: attr(data-replicated-value) " ";

  /* This is how textarea text behaves */
  white-space: pre-wrap;

  /* Hidden from view, clicks, and screen readers */
  visibility: hidden;
}
.grow-wrap > textarea {
  /* You could leave this, but after a user resizes, then it ruins the auto sizing */
  resize: none;

  /* Firefox shows scrollbar on growth, you can hide like this. */
  overflow: hidden;
}
.grow-wrap > textarea,
.grow-wrap::after {
  /* Identical styling required!! */
  border: 1px solid black;
  padding: 0.5rem;
  font: inherit;

  /* Place on top of each other */
  grid-area: 1 / 1 / 2 / 2;
}

body {
  margin: 2rem;
  font: 1rem/1.4 system-ui, sans-serif;
}

label {
  display: block;
}