Css Zero Showcase
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<div class="input input--actor flex items-center gap" data-controller="copyable-input">
  <input type="text" name="copyable_field" id="copyable_field" value="ZNWo79Lupo3K39q74MudihEMjVcMpSZC" readonly="readonly" data-copyable-input-target="input" />
  <button class="btn btn--plain" data-action="copyable-input#copy">
    <img aria-hidden="true" data-copyable-input-target="copyIcon" hidden="hidden" src="/assets/copy-6b663b6e.svg" width="20" height="20" />
    <img aria-hidden="true" data-copyable-input-target="successIcon" hidden="hidden" src="/assets/check-f9df2b62.svg" width="20" height="20" />
    <span class="sr-only">Copy to clipboard</span>
  </button>
</div>
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<div class="input input--actor flex items-center gap" data-controller="copyable-input">
  <%= text_field_tag "copyable_field", SecureRandom.base58(32), readonly: "readonly", data: { copyable_input_target: "input" } %>
  <button class="btn btn--plain" data-action="copyable-input#copy">
    <%= image_tag "copy.svg",  size: 20, aria: { hidden: true }, data: { copyable_input_target: "copyIcon" }, hidden: true %>
    <%= image_tag "check.svg", size: 20, aria: { hidden: true }, data: { copyable_input_target: "successIcon" }, hidden: true %>
    <span class="sr-only">Copy to clipboard</span>
  </button>
</div>
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.input {
  appearance: none;
  background-color: var(--input-background, var(--color-bg));
  border: 1px solid var(--input-border-color, var(--color-border));
  border-radius: var(--input-radius, var(--rounded-md));
  font-size: var(--input-font-size, var(--text-sm));
  inline-size: var(--size-full);
  padding: var(--input-padding, 0.5rem 1rem);
  option {
    padding-block: 2px;
  }
  &:is(textarea[rows=auto]) {
    field-sizing: content;
    max-block-size: calc(10lh + var(--size-6));
    min-block-size: calc(3lh  + var(--size-6));
  }
  &:is(select):not([multiple], [size]) {
    background-image: url("select-arrow.svg");
    background-position: center right var(--size-2);
    background-repeat: no-repeat;
    background-size: var(--size-4) auto;
  }
  &::file-selector-button {
    font-weight: var(--font-medium);
    margin-inline-end: var(--size-2);
  }
  &:user-invalid {
    border-color: var(--color-negative);
  }
  &:user-invalid ~ .invalid-feedback {
    display: flex;
  }
  &:disabled {
    cursor: not-allowed;
    opacity: var(--opacity-50);
  }
}
/* Hide invalid feedback by default */
.invalid-feedback {
  display: none;
}
/* Containers that act like (and contain) inputs */
.input--actor {
  input {
    border: 0; inline-size: 100%; outline: 0;
  }
  img:not([class]) {
    filter: var(--input-icon-color, var(--color-filter-text));
  }
  &:focus-within {
    outline: var(--input-outline-size, 2px) solid var(--color-selected-dark);
    outline-offset: var(--border-2);
  }
}
/* Checkbox, radio, and range */
.checkbox, .radio {
  accent-color: var(--color-primary); transform: scale(1.15);
}
.range {
  accent-color: var(--color-primary);
}
/* Styles that are shared between components */
:is(.input, .checkbox, .radio, .range) {
  &:focus-visible {
    outline: var(--input-outline-size, 2px) solid var(--color-selected-dark);
    outline-offset: var(--border-2);
  }
  .field_with_errors & {
    border-color: var(--color-negative);
  }
}
Java Script is not required or multiple files are needed, check the notes.

The javascript is avilable at copyable input controller