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

<style include="profile-picker-shared cr-hidden-style">
  :host {
    --avatar-icon-size: 74px;
    --banner-img-height: 400px;
    --banner-img-width: 169px;
  }

  .banner {
    height: var(--banner-img-height);
    overflow: hidden;
    position: absolute;
    top: 0;
    width: var(--banner-img-width);
    z-index: -1;
  }

  #leftBanner {
    background: url(images/left_banner_image.svg);
    left: 0;
  }

  #rightBanner {
    background: url(images/right_banner_image.svg);
    right: 0;
  }

  .title-container {
    margin: 30px auto 0 auto;
    padding-inline-end: calc(var(--banner-img-width) - 10px);
    padding-inline-start: calc(var(--banner-img-width) - 10px);
    text-align: center;
  }

  #wrapper {
    display: flex;
    height: calc(max(100vh, var(--view-min-size)) - 290px);
    margin-inline-end: 140px;
    margin-inline-start: 140px;
  }

  .profiles-container {
    --grid-gutter: 24px;
    --profile-item-height:178px;
    --profile-item-width: 162px;
    align-items: center;
    display: grid;
    grid-column-gap: var(--grid-gutter);
    grid-row-gap: var(--grid-gutter);
    grid-template-columns: repeat(auto-fit, var(--profile-item-width));
    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%;
  }

  .profiles-container::-webkit-scrollbar {
    width: var(--scrollbar-width);
  }

  /* Track */
  .profiles-container::-webkit-scrollbar-track {
    border-radius: var(--scrollbar-width);
  }

  /* Handle */
  .profiles-container::-webkit-scrollbar-thumb {
    background: var(--scrollbar-background);
    border-radius: var(--scrollbar-width);
  }

  .profile-item {
    align-items: center;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    height: var(--profile-item-height);
    justify-content: center;
    width: var(--profile-item-width);
  }

  #addProfile {
    border: 1px dashed;
    border-color: var(--google-grey-400);
  }

  cr-icon-button[iron-icon='profiles:add'] {
    --cr-icon-button-icon-size: var(--avatar-icon-size);
    --cr-icon-button-size: 84px;
    --cr-icon-button-fill-color: var(--google-grey-refresh-100);
    --cr-icon-button-margin-end: 0;
    --cr-icon-button-margin-start: 0;
    --cr-icon-button-stroke-color: var(--google-grey-refresh-700);
  }

  .footer > * {
    background-color: rgba(255, 255, 255, .8);
  }

  #browseAsGuestButton {
    margin-inline-start: var(--footer-margin);
  }

  #browseAsGuestButton > iron-icon {
    margin-inline-end: 8px;
  }

  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-margin);
    margin-inline-start: auto;
    padding-inline-end: 5px;
    padding-inline-start: 5px;
  }

  @media (prefers-color-scheme: dark) {
    #leftBanner {
      background: url(images/dark_mode_left_banner_image.svg);
    }

    #rightBanner {
      background: url(images/dark_mode_right_banner_image.svg);
    }

    #addProfile {
      border-color: var(--google-grey-refresh-700);
    }

    cr-icon-button[iron-icon='profiles:add'] {
      --cr-icon-button-fill-color: var(--google-grey-refresh-500);
      --cr-icon-button-stroke-color: rgb(48, 48, 50);
      color: var(--google-grey-refresh-500);
    }

    .footer > * {
      background-color: rgba(0, 0, 0, .5);
    }
  }
</style>

<div id="leftBanner" class="banner"></div>
<div class="title-container">
  <img id="product-logo" on-click="onProductLogoTap_"
      srcset="chrome://theme/current-channel-logo@1x 1x,
              chrome://theme/current-channel-logo@2x 2x"
      role="presentation">
  <h2>$i18n{mainViewTitle}</h2>
  <h3>$i18n{mainViewSubtitle}</h3>
</div>
<div id="wrapper" hidden$="[[!profilesListLoaded_]]">
  <div class="profiles-container">
    <template is="dom-repeat" items="[[profilesList_]]">
      <profile-card
          class="profile-item" profile-state="[[item]]">
      </profile-card>
    </template>
    <div id="addProfile" class="profile-item">
      <div class="profile-card-info">$i18n{addSpaceButton}</div>
      <cr-icon-button iron-icon="profiles:add"
          on-click="onAddProfileClick_" aria-label$="$i18n{addSpaceButton}">
      </cr-icon-button>
      <!-- Empty div to maintain alignment with other profile cards. -->
      <div class="profile-card-info"></div>
    </div>
  </div>
</div>
<div id="rightBanner" class="banner"></div>

<div class="footer">
  <cr-button id="browseAsGuestButton" on-click="onLaunchGuestProfileClick_">
    <iron-icon icon="profiles:account-circle"></iron-icon>
    <div>$i18n{browseAsGuestButton}</div>
  </cr-button>
  <cr-checkbox checked="{{askOnStartup_}}"
      on-change="onAskOnStartupChangedByUser_" hidden$="[[hideAskOnStartup_]]">
    $i18n{askOnStartupCheckboxText}
  </cr-checkbox>
</div>