app/views/errors/bad_request.html.erb
<h1><%= title "Bad Request" %></h1>
<div class="row">
<div class="col-xs-10 col-sm-6 offset-xs-1 offset-sm-3">
<div class="card my-5">
<div class="card-body">
<i class="fas fa-4x fa-bug float-end"></i>
<h4 class="card-title">Bad Request</h4>
<h6 class="card-subtitle mt-2 mb-3 text-muted">Hmm, something doesn't seem right with that request.</h6>
<p class="card-text">Were you trying to do something bad?</p>
</div>
</div>
</div>
</div>