overleaf/services/web/frontend/stylesheets/bootstrap-5/components/form.scss

.form-check-input {
  @function form-check-box-svg($color) {
    @return url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><path fill='none' stroke='#{$color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/></svg>");
  }

  @function form-check-radio-svg($color) {
    @return url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='2' fill='#{$color}'/></svg>");
  }

  @function form-check-indeterminate-svg($color) {
    @return url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><path fill='none' stroke='#{$color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10h8'/></svg>");
  }

  &:hover {
    &:not(:disabled) {
      border-color: var(--border-hover);

      &:checked,
      &[type='checkbox']:indeterminate {
        background-color: var(--bg-accent-02);
        border-color: var(--bg-accent-02);
      }
    }
  }

  &:disabled {
    @mixin input-disabled-styles {
      background-color: $input-disabled-bg;
      border-color: $input-disabled-border-color;
    }

    @include input-disabled-styles;

    &[type='checkbox']:indeterminate {
      @include input-disabled-styles;

      background-image: escape-svg(form-check-indeterminate-svg($neutral-40));
    }
  }

  // Use disabled attribute in addition of :disabled pseudo-class
  // See: https://github.com/twbs/bootstrap/issues/28247
  &[disabled],
  &:disabled {
    ~ .form-check-label {
      color: $input-disabled-color;
    }

    &:checked {
      &[type='checkbox'] {
        background-image: escape-svg(form-check-box-svg($neutral-40));
      }

      &[type='radio'] {
        background-image: escape-svg(form-check-radio-svg($neutral-40));
      }
    }
  }

  &:focus-visible {
    outline: 0;
    border-color: $input-focus-border-color;
    box-shadow: $input-focus-box-shadow;
  }
}

.form-control {
  &[disabled],
  &:disabled {
    &::placeholder {
      color: var(--content-disabled);
    }
  }
}

.form-text {
  display: inline-flex;
  gap: $spacing-02;
  line-height: var(--line-height-02);

  .form-control[disabled] ~ & {
    color: var(--content-disabled);
  }
}

.form-label {
  &:has(+ .form-control[disabled]) {
    color: var(--content-disabled);
  }
}

.form-group {
  margin-bottom: $form-group-margin-bottom;
}

.form-control-wrapper {
  position: relative;

  &.form-control-wrapper-disabled {
    .form-control-start-icon,
    .form-control-end-icon {
      & > * {
        color: var(--content-disabled);
      }
    }
  }

  .form-control-start-icon,
  .form-control-end-icon {
    position: absolute;
    top: 0;
    height: 100%;
    display: flex;
    align-items: center;
    font-size: 0;
  }

  .form-control-start-icon {
    left: 0;
    padding-left: calc(var(--form-control-padding-x) + var(--bs-border-width));
  }

  .form-control-end-icon {
    right: 0;
    padding-right: calc(var(--form-control-padding-x) + var(--bs-border-width));
  }

  --icon-width: 20px;
  --form-control-padding-x: var(--spacing-04);
  --form-control-icon-offset-y: var(--spacing-04);

  &.form-control-wrapper-sm {
    --form-control-padding-x: var(--spacing-03);
    --form-control-icon-offset-y: var(--spacing-02);
  }

  &.form-control-wrapper-lg {
    --form-control-padding-x: var(--spacing-05);
    --form-control-icon-offset-y: var(--spacing-05);
  }

  .form-control-offset-start {
    padding-left: calc(
      var(--form-control-padding-x) + var(--form-control-icon-offset-y) +
        var(--icon-width)
    );
  }

  .form-control-offset-end {
    padding-right: calc(
      var(--form-control-padding-x) + var(--form-control-icon-offset-y) +
        var(--icon-width)
    );
  }
}

.form-control,
.form-select {
  &:focus,
  &:invalid:focus,
  &.is-invalid:focus,
  &:focus-visible,
  &:invalid:focus-visible,
  &.is-invalid:focus-visible {
    color: $input-focus-color;
    background-color: $input-focus-bg;
    outline: 0;
    border-color: $input-focus-border-color;
    box-shadow: $input-focus-box-shadow;
  }
}