How to stylize Ruby on rails devise forms - css

Question

This is my registration form which is using devise but for some reason, my CSS only affects the First_Name part and nothing else. On top of that, the First Name part looks slightly different from the other bars in terms of its border color. I did install bootstrap but I haven't had a problem like this on other pages so I don't think that's the issue.
<h2>Sign up</h2>
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<div class="field input">
<%=f.label :First_Name%>
<%=f.text_field :fname, class:"form-control",:autofocus => true %>
</div>
<div class="field input">
<%= f.label :email %><br />
<%= f.email_field :email, autofocus: true, autocomplete: "email" %>
</div>
<div class="field input">
<%= f.label :password %>
<% if #minimum_password_length %>
<em>(<%= #minimum_password_length %> characters minimum)</em>
<% end %><br />
<%= f.password_field :password, autocomplete: "off" %>
</div>
<div class="field input">
<%= f.label :password_confirmation %><br />
<%= f.password_field :password_confirmation, autocomplete: "off" %>
</div>
<div class="actions">
<%= f.submit "Sign up" %>
</div>
<%= render "devise/shared/links" %>
<style>
.input{
width: 25%;
text-decoration: none;
}
</style>

Answer 1

You have to apply .form-control class to input fields for appling Bootstrap style.
In your code only first name (fname) has .form-control - You have to add it to other input fields as well.
Example for email field:
<%= f.email_field :email, autofocus: true, autocomplete: "email", class:"form-control" %>