app/web/views/register.erb
<form action="/register" method="post">
<div class="field">
<label class="label" for="username">Username</label>
<div class="control">
<input name="username" id="username" class="input" type="text">
</div>
</div>
<div class="field">
<label class="label" for="password">Password</label>
<div class="control">
<input name="password" id="password" class="input" type="password">
</div>
</div>
<div class="field">
<label class="label" for="email">Email</label>
<div class="control">
<input name="email" id="email" class="input" type="email">
</div>
</div>
<div class="control">
<button class="button is-primary">Register</button>
</div>
</form>