counter/frontend/components/cluster-new/_cluster-new.html.erb

<div class="create-cluster-form">
    <%= form_tag cluster_path, method: :post do  %>
        <%= text_field_tag :cluster, "", class: "create-cluster-form--input", placeholder: "Cluster Name", autofocus: true, required: true %>
        <%= submit_tag "Create", class: "create-cluster-form--submit" %>
    <% end %>
</div>