Css Zero Showcase
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<!-- Text Area -->
<textarea name="text_area" id="text_area" rows="3" class="input">
</textarea>
<!-- Text Area With Auto Grow -->
<textarea name="text_area_with_auto_grow" id="text_area_with_auto_grow" rows="auto" class="input">
</textarea>
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<%# Text Area %>
<%= text_area_tag "text_area", nil, rows: 3, class: "input" %>
<%# Text Area With Auto Grow %>
<%= text_area_tag "text_area_with_auto_grow", nil, rows: "auto", class: "input" %>
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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(--input-inline-size, var(--size-full));
  min-block-size: var(--input-block-size, var(--size-10));  
  padding: var(--input-padding, 0.5rem 0.75rem);
  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.

Text area with auto grow is not supported in all browsers.