I'd want to use Bootstrap to update the appearance of my forms.
Here's how my form's current view looks (it's quite basic...)
<div class="field">
<%= form.label :first_name %>
<%= form.text_field :first_name %>
</div>
<div class="field">
<%= form.label :last_name %>
<%= form.text_field :last_name %>
</div>
<div class="field">
<%= form.label :age %>
<%= form.number_field :age %>
</div>
<div class="field">
<%= form.label :email %>
<%= form.text_field :email %>
</div>
<div class="actions">
<%= form.submit %>
</div>
<form>
<div class="mb-3">
<label for="exampleInputEmail1" class="form-label">Email address</label>
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
<div id="emailHelp" class="form-text">We'll never share your email with anyone else.</div>
</div>
<div class="mb-3">
<label for="exampleInputPassword1" class="form-label">Password</label>
<input type="password" class="form-control" id="exampleInputPassword1">
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
I'm not sure how to combine the ruby code and the HTML.