app/views/devise/sessions/new.html.erb
<div class="session-new ui middle aligned center aligned grid">
<div class="column">
<h2 class="ui image header">
<img src="/static-images/logo.svg" class="image">
<div class="content">
Log-in to your account
</div>
</h2>
<div class='ui stacked segment'>
<%= form_for(resource, as: resource_name, url: session_path(resource_name), html: { class: 'ui large form' }) do |f| %>
<div class="field">
<div class="ui left icon input">
<%= f.email_field :email, autofocus: true, placeholder: "Email address" %>
<i class="user icon"></i>
</div>
</div>
<div class="field">
<div class="ui left icon input">
<%= f.password_field :password, autocomplete: "off", placeholder: 'Password' %>
<i class="lock icon"></i>
</div>
</div>
<% if devise_mapping.rememberable? -%>
<div class="field">
<%= f.check_box :remember_me %>
<%= f.label :remember_me %>
</div>
<% end -%>
<div class="actions">
<%= f.submit "Log in" %>
</div>
<% end %>
</div>
<%= render "devise/shared/links" %>
</div>
</div>