szurubooru/client/html/file_dropper.tpl

<div class='file-dropper-holder'>
    <input type='file' id='<%- ctx.id %>'/>
    <label class='file-dropper' for='<%- ctx.id %>' role='button'>
        <% if (ctx.allowMultiple) { %>
            Drop files here!
        <% } else { %>
            Drop file here!
        <% } %>
        <br/>
        Or just click on this box.
    </label>
    <% if (ctx.allowUrls) { %>
        <input type='text' name='url' placeholder='Alternatively, paste an URL here.'/>
        <button>Add URL</button>
    <% } %>
</div>