SillyTavern/public/scripts/extensions/assets/window.html

<div id="assets_ui">
    <div class="inline-drawer">
        <div class="inline-drawer-toggle inline-drawer-header">
            <b>Assets</b>
            <div class="inline-drawer-icon fa-solid fa-circle-chevron-down down"></div>
        </div>
        <div class="inline-drawer-content">
            <label for="assets-json-url-field">Assets URL</label>
            <div class="assets-connect-div">
                <input id="assets-json-url-field" class="text_pole widthUnset flex1">
                <i id="assets-connect-button" class="menu_button fa-solid fa-plug fa-xl"></i>
            </div>
            <div>
                <p>Please refresh ST after downloading new asset to use them.</p>
            </div>
            <div class="inline-drawer-content" id="assets_menu">
            </div>
        </div>
    </div>
</div>