react-example-list-custom-checkbox

div[data-custom-list-css-enabled] .ProseMirror .prosemirror-flat-list[data-list-kind="task"] {
  & > .list-marker label {
    box-sizing: border-box;
    display: flex;
    position: relative;
    left: calc(var(--spacing) * -0.5);
    align-items: center;
    cursor: pointer;
    transition: transform 0.15s ease-in-out;

    &:hover {
      transform: scale(1.1);
    }

    &::after {
      position: absolute;
      width: calc(var(--spacing) * 5);
      height: calc(var(--spacing) * 5);
      content: "";
      color: var(--color-white);
      opacity: 0;
    }

    /* https://api.iconify.design/lucide.css?icons=check */
    &::after {
      display: inline-block;
      background-color: currentColor;
      -webkit-mask-image: var(--svg);
      mask-image: var(--svg);
      -webkit-mask-repeat: no-repeat;
      mask-repeat: no-repeat;
      -webkit-mask-size: 100% 100%;
      mask-size: 100% 100%;
      --svg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24'%3E%3Cpath fill='none' stroke='black' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");
    }

    & input {
      box-sizing: border-box;
      appearance: none;
      width: calc(var(--spacing) * 5);
      height: calc(var(--spacing) * 5);
      margin: 0;
      border-width: 1px;
      border-style: solid;
      border-radius: var(--radius-md);
      border-color: color-mix(in srgb, var(--color-gray-300) 50%, transparent);
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      transition: all 0.15s ease-in-out;

      &:hover {
        box-shadow: var(--shadow-md);
      }

      &:checked {
        border-color: var(--color-red-500);
        background-color: var(--color-red-500);
      }
    }
  }

  &[data-list-checked] > .list-marker label {
    &::after {
      opacity: 1;
    }
  }

  &[data-list-checked] {
    color: var(--color-gray-400);
    text-decoration: line-through;
    text-decoration-color: var(--color-gray-400);
  }
}