chrome/browser/resources/print_preview/ui/margin_control.html

<style include="cr-input-style">
  :host {
    display: block;
    position: absolute;
    transition: opacity 150ms linear;
  }

  :host([invisible]) {
    opacity: 0;
  }

  :host([disabled]),
  :host([invisible]) {
    pointer-events: none;
  }

  :host([side=top]) #lineContainer,
  :host([side=bottom]) #lineContainer {
    cursor: ns-resize;
    padding: 8px 0;
    width: 100%;
  }

  :host([side=left]) #lineContainer,
  :host([side=right]) #lineContainer {
    cursor: ew-resize;
    height: 100%;
    padding: 0 8px;
  }

  #line {
    border: 1px dashed var(--google-blue-500);
  }

  @media (prefers-color-scheme: dark) {
    #line {
      border-color: var(--google-blue-300);
    }
  }

  :host([side=top]) #line,
  :host([side=bottom]) #line {
    width: 100%;
  }

  :host([side=left]) #line,
  :host([side=right]) #line {
    height: 100%;
  }

  #row-container {
    border-radius: 4px;
    font-size: 0.8rem;
    min-height: 25px;
    overflow: hidden;
    padding: 1px;
    position: absolute;
  }

  @media (prefers-color-scheme: light) {
    #row-container {
      --cr-input-background-color: var(--cr-primary-text-color);
      --cr-input-color: white;
      background-color: var(--cr-primary-text-color);
      color: white;
    }
  }

  @media (prefers-color-scheme: dark) {
    #row-container {
      --cr-input-background-color: rgb(27, 28, 30);  /* GG900 + 30% black */
      --cr-input-color: var(--cr-primary-text-color);
      background-color: rgb(27, 28, 30);  /* GG900 + 30% black */
      color: var(--cr-primary-text-color);
    }
  }

  :host([side=top]) #row-container {
    left: 50%;
    top: 9px;
  }

  :host([side=right]) #row-container {
    right: 9px;
    top: 50%;
  }

  :host([side=bottom]) #row-container {
    bottom: 9px;
    right: 50%;
  }

  :host([side=left]) #row-container {
    bottom: 50%;
    left: 9px;
  }

  :host([disabled]) #row-container {
    opacity: var(--cr-disabled-opacity);
  }

  :host([invalid]) #input {
    caret-color: var(--cr-input-error-color);
  }

  :host([invalid]) #underline {
    border-color: var(--cr-input-error-color);
  }

  #row-container,
  #input-container {
    align-items: center;
    display: flex;
  }

  #input-container {
    position: relative;
  }

  #input {
    padding-inline-end: 0;
    text-align: end;
    width: 44px;
  }

  #unit {
    padding-inline-end: 8px;
  }
</style>
  <div id="lineContainer">
    <div id="line"></div>
  </div>
  <div id="row-container">
    <div id="input-container">
      <input id="input" disabled="[[disabled]]" aria-label$="[[i18n(side)]]"
          aria-hidden$="[[getAriaHidden_(invisible)]]"
          on-focus="onFocus_" on-blur="onBlur_" on-change="onInputChange_"
          data-timeout-delay="1000">
      <span id="unit">[[measurementSystem.unitSymbol]]</span>
    </div>
    <div id="underline"></div>
  </div>
</div>