dark-mode-utils.css

/*
  Makes the content visible in the dark mode.
*/
.awsui-util-show-in-dark-mode {
  display: none;
}
@supports (--css-variable-support-check: #000) {
  @media not print {
    .awsui-dark-mode .awsui-util-show-in-dark-mode {
      display: initial;
    }
  }
}

/*
  Makes the content hidden in the dark mode.
*/
@supports (--css-variable-support-check: #000) {
  @media not print {
    .awsui-dark-mode .awsui-util-hide-in-dark-mode {
      display: none;
    }
  }
}