chromium/chrome/browser/resources/chromeos/parent_access/parent_access_template.html

<style include="cr-icons cros-color-overrides">
    .template-container {
        display: flex;
        flex-direction: column;
        height: 100%;
        justify-content: flex-start;
        position: relative;
        width: 100%;
    }

    .title-bar {
        background-color: transparent;
        border-top-left-radius: 11px;
        border-top-right-radius: 11px;
        height: 36px;
        position: absolute;
        width: 600px;
        /* Allows title bar to be superimposed on top of content-container */
        z-index: 2;
    }

    #closeButton {
        margin: 2px 2px 2px 566px;
    }

    .content-container {
        display: flex;
        height: 100%;
        position: absolute;
        width: 100%;
        z-index: 1;
    }

    .main {
      height: 100%;
      width: 100%;
    }
</style>

<div class="template-container">
    <div class="title-bar">
        <cr-icon-button id="closeButton" class="icon-clear"
            title="$i18n{closeButtonTitle}" aria-label="$i18n{closeButtonTitle}"
            on-click="onParentAccessDialogClosed">
        </cr-icon-button>
    </div>
    <div class="content-container">
        <div class="main">
            <slot name="main"></slot>
        </div>
    </div>
</div>