jellyfin-web/src/apps/dashboard/controllers/devices/device.html

<div id="devicePage" data-role="page" class="page type-interior devicesPage noSecondaryNavPage">
    <div>
        <div class="content-primary">
            <form class="deviceForm">
                <div class="verticalSection verticalSection-extrabottompadding">
                    <div class="sectionTitleContainer flex align-items-center">
                        <h2 class="sectionTitle reportedName"></h2>
                    </div>

                    <div class="inputContainer">
                        <input is="emby-input" type="text" id="txtCustomName" label="${LabelDisplayName}" />
                        <div class="fieldDescription">${LabelCustomDeviceDisplayNameHelp}</div>
                    </div>
                </div>
                <div>
                    <button is="emby-button" type="submit" class="raised button-submit block">
                        <span>${Save}</span>
                    </button>
                </div>
            </form>
        </div>
    </div>
</div>