wagtail/client/scss/layouts/_account.scss

.w-avatar-panel {
  &__image {
    // do not display the user image if the clearing image is checked
    .avatar-clear:checked ~ .avatar.avatar-span {
      display: none;
    }

    // do not display the gravatar image when the input is not checked
    .avatar-clear:not(:checked) ~ .avatar.gravatar {
      display: none;
    }
  }

  &__form {
    label {
      display: block;
      padding: 0;
      width: unset;
      margin-bottom: 10px;
    }
  }
}