app/views/devise/sessions/new.html.erb
<h2>Log in</h2>
<%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
<md-input-container>
<%= f.label :login, 'Email/Username' %>
<%= f.text_field :login, autocomplete: "off" %>
</md-input-container>
<br>
<md-input-container>
<%= f.label :password %>
<%= f.password_field :password, autocomplete: "off" %>
</md-input-container>
<br>
<md-button type="submit" class="md-raised md-primary">Login</md-button>
<% end %>
<!-- Reset password link -->
<br><%= link_to 'Forgot your password?', new_password_path(resource_name) %>