sessions/new.html.erb

<h1>Sign in </h1>
<%= form_with url: sign_in_path, local: true do |form| %>
   <div class="mb-3">
    <%= form.label :email %>
    <%= form.text_field :email,class: "form-control", placeholder: "example@gmail.com" %>
    </div>
    <div class="mb-3">
    <%= form.label :password %>

    <%= form.password_field :password,class: "form-control" , placeholder: "password" %>
    </div>
        <div class="mb-3">
    <%= form.submit "Sign in", class: "btn btn-primary" %>
    </div>
<% end %>