nutui/src/packages/checkbox/index.scss

.nut-checkboxgroup-vertical .nut-checkbox {
  display: block;
  margin-top: 8px;
}
.nut-checkbox {
  margin-right: 10px;
  .nut-checkbox-label {
    pointer-events: none;
    vertical-align: middle;
  }
  input {
    position: relative;
    -webkit-appearance: none;
    border-radius: 1%;
    background-image: url('https://img11.360buyimg.com/imagetools/jfs/t1/153637/38/10229/854/5fd9cfd3E25c62c2a/fed43bc74cd473dd.png');
    background-size: cover;
    outline: 0;
    opacity: 1;
    vertical-align: middle;
    margin: 0;
    &::after {
      position: absolute;
      left: 50%;
      top: 50%;
      content: '';
      width: 0;
      height: 0;
      transform: translate(-50%, -50%);
      background: $primary-color;
      border-radius: 1%;
      opacity: 0;
      pointer-events: none;
    }
    &:checked {
      background-image: url('https://img13.360buyimg.com/imagetools/jfs/t1/131359/19/19372/2463/5fd3101bEdaf04120/3c8fa97cd4b22c02.png');
      background-repeat: no-repeat;
      background-position: center;
      border-color: $primary-color;
      &:not(:disabled).nut-checkbox-ani::after {
        animation: nutPulse 0.25s;
      }
    }
    &:disabled {
      background-image: url('https://img14.360buyimg.com/imagetools/jfs/t1/155506/4/9365/704/5fd3103cE779ad491/1939699720df7770.png');
      // border-color: $disable-color;
      &:checked {
        background-image: url('https://img12.360buyimg.com/imagetools/jfs/t1/151947/10/10769/2246/5fe04ceeEd31c1a06/2bb48d747c49f9dd.png');
      }
    }
  }
  .nut-checkbox-label {
    color: #1d1e1e;
  }
  &.nut-checkbox-size-base {
    input {
      width: 18px;
      height: 18px;
    }
    .nut-checkbox-label {
      font-size: $font-size-2;
      margin-left: 10px;
    }
  }
  &.nut-checkbox-size-small {
    input {
      width: 16px;
      height: 16px;
    }
    .nut-checkbox-label {
      font-size: $font-size-1;
      margin-left: 6px;
    }
  }
  &.nut-checkbox-size-large {
    input {
      width: 22px;
      height: 22px;
    }
    .nut-checkbox-label {
      font-size: $font-size-3;
      margin-left: 10px;
    }
  }
}
@keyframes nutPulse {
  0% {
    width: 100%;
    height: 100%;
    opacity: 0.5;
  }
  100% {
    width: 150%;
    height: 150%;
    opacity: 0;
  }
}