app/views/my/_block.html.erb
<div id="block_<%= block_name.dasherize %>" class="mypage-box">
<div style="float:right;margin-right:16px;z-index:500;">
<%= link_to '',
{ action: 'remove_block', block: block_name },
method: 'post',
class: 'close-icon' %>
</div>
<div class="handle">
<%= render_block(user, block_name) %>
</div>
</div>