<%= form_tag notice_path, :method => :post, :class => "uk-form" do %>
<% end %>
ex)
<div>
<%= form_tag notice_path, :method => :post do %>
<div class="uk-margin">
<%= text_field_tag :title , '', class: "uk-width-1-1 uk-input", placeholder: '通知タイトル' %>
</div>
<div class="uk-margin">
<%= text_area_tag :contents , '', class: "uk-width-1-1 uk-textarea", rows: 4, placeholder: 'お知らせ内容' %>
</div>
<div class="uk-margin">
<%= submit_tag("送信", class: "uk-button uk-button-primary") %>
</div>
<% end %>
</div>
[ rails form_tag の中でhiddenパラメータを扱う時 ]
<div class="field">
<%= f.hidden_field :sender_type, :value => 1 %>
</div>