chrome/browser/resources/signin/profile_picker/profile_picker_main_view.html

<style include="profile-picker-shared cr-hidden-style cr-shared-style">
  :host {
    --profile-item-border-width: 1px;
    --profile-item-margin: 4px;
  }

  .flex-container {
    display: flex;
    flex-flow: column;
    height: calc(100% - var(--cr-button-height) - 2 * var(--footer-spacing));
    justify-content: space-evenly;
  }

  .title-container {
    /* TODO(crbug.com/1441029): dedupe with |--tangible-sync-style-banner-width|
     * from |tangible_sync_style_shared.css| */
    --banner-width: 17vw;

    flex: 0 1 auto;
    margin: 30px auto 0 auto;
    max-width: 490px;
    padding-inline-end: var(--banner-width);
    padding-inline-start: var(--banner-width);
    text-align: center;
  }

  #product-logo {
    height: 32px;
  }

  .title {
    margin-bottom: 8px;
  }

  .subtitle {
    margin-top: 8px;
  }

  #wrapper {
    display: flex;
    flex: 0 1 auto;
    margin-bottom: 4px;
    margin-inline-end: 140px;
    margin-inline-start: 140px;
    min-height: calc(var(--profile-item-height) + 2*var(--profile-item-margin)
      + 2*var(--profile-item-border-width));
    overflow-x: hidden;
    overflow-y: auto;
  }

  #profilesContainer {
    --grid-gutter: 8px;
    align-items: center;
    display: grid;
    /* Actual gap: --grid-gutter + 2 * --profile-item-margin = 16px */
    grid-column-gap: var(--grid-gutter);
    grid-row-gap: var(--grid-gutter);
    grid-template-columns: repeat(auto-fit, calc(var(--profile-item-width) +
      2 * var(--profile-item-margin)));
    justify-content: center;
    margin: auto;
    max-height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    padding-inline-end: var(--scrollbar-width);
    padding-inline-start: var(--scrollbar-width);
    width: 100%;
  }

  .profile-item {
    align-items: center;
    border: 1px solid var(--google-grey-300);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    height: var(--profile-item-height);
    justify-content: center;
    margin: var(--profile-item-margin);
    width: var(--profile-item-width);
  }

  .profile-item:focus-within,
  .profile-item:hover {
    background-color: var(--profile-card-hover-color);
  }

  #addProfile.profile-item {
    --hover-bg-color: none;
    border: var(--profile-item-border-width) dashed var(--google-grey-300);
    box-shadow: none;
    position: relative;
  }

  #addProfileButtonLabel {
    top: 0;
  }

  :host-context([chrome-refresh-2023]) #addProfileButtonLabel {
    left: 0;
  }

  iron-icon[icon='profiles:add'] {
    --iron-icon-height: var(--profile-card-avatar-icon-size);
    --iron-icon-width: var(--profile-card-avatar-icon-size);
    --iron-icon-fill-color: var(--google-grey-100);
    --iron-icon-stroke-color: var(--google-grey-700);
  }

  #browseAsGuestButton {
    margin-inline-start: var(--footer-spacing);
    padding: 8px 16px;
  }

  #browseAsGuestButton > iron-icon {
    margin-inline-end: 0;
    --iron-icon-height: 24px;
    --iron-icon-width: 24px;
  }

  cr-checkbox {
    --cr-checkbox-label-color:  var(--cr-secondary-text-color);
    --cr-checkbox-label-padding-start: 8px;
    justify-content: flex-end;
    margin-inline-end: var(--footer-spacing);
    margin-inline-start: auto;
    padding-inline-end: 5px;
    padding-inline-start: 5px;
  }

  @media (prefers-color-scheme: dark) {
    .profile-item,
    #addProfile.profile-item {
      border-color: var(--google-grey-700);
    }

    iron-icon[icon='profiles:add'] {
      --iron-icon-fill-color: var(--google-grey-500);
      --iron-icon-stroke-color: rgb(48, 48, 50);
    }
  }
</style>

<div class="flex-container">
  <div class="title-container">
    <img id="product-logo" on-click="onProductLogoClick_"
        srcset="chrome://theme/current-channel-logo@1x 1x,
                chrome://theme/current-channel-logo@2x 2x"
        role="presentation">
    <h1 class="title">$i18n{mainViewTitle}</h1>
    <div class="subtitle">$i18n{mainViewSubtitle}</div>
  </div>
  <div id="wrapper">
    <div id="profilesContainer" class="custom-scrollbar"
        hidden$="[[!profilesListLoaded_]]">
      <template is="dom-repeat" items="[[profilesList_]]">
        <profile-card
            class="profile-item" profile-state="[[item]]">
        </profile-card>
      </template>
      <cr-button id="addProfile" class="profile-item"
          on-click="onAddProfileClick_"
          aria-labelledby="addProfileButtonLabel">
        <div id="addProfileButtonLabel"
            class="profile-card-info prominent-text">
          $i18n{addSpaceButton}
        </div>
        <iron-icon icon="profiles:add"></iron-icon>
      </cr-button>
    </div>
  </div>
</div>
<div class="footer">
  <cr-button id="browseAsGuestButton" on-click="onLaunchGuestProfileClick_">
    <iron-icon icon="profiles:account-circle" slot="prefix-icon"></iron-icon>
    $i18n{browseAsGuestButton}
  </cr-button>
  <cr-checkbox id="askOnStartup" checked="{{askOnStartup_}}"
      on-change="onAskOnStartupChangedByUser_" hidden$="[[hideAskOnStartup_]]">
    $i18n{askOnStartupCheckboxText}
  </cr-checkbox>
</div>