Passo 54

Instruções

Com um display de block o botão de enviar fica na borda esquerda do elemento pai. Use a mesma técnica usada para centralizar o form para centralizar o botão de enviar.

O que fazer:

Testes:

Você deve dar ao botão de enviar uma `margin` de `0 auto`.
Você não deve dar ao botão enviar uma `min-width` ou uma `max-width`.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Registration Form</title>
  <link rel="stylesheet" href="styles.css" />
</head>
<body>
  <h1>Registration Form</h1>
  <p>Please fill out this form with the required information</p>
  <form method="post" action='https://register-demo.G.E.A.R ACADEMY.org'>
    <fieldset>
      <label for="first-name">Enter Your First Name: <input id="first-name" name="first-name" type="text" required /></label>
      <label for="last-name">Enter Your Last Name: <input id="last-name" name="last-name" type="text" required /></label>
      <label for="email">Enter Your Email: <input id="email" name="email" type="email" required /></label>
      <label for="new-password">Create a New Password: <input id="new-password" name="new-password" type="password" pattern="[a-z0-5]{8,}" required /></label>
    </fieldset>
    <fieldset>
      <legend>Account type (required)</legend>
      <label for="personal-account"><input id="personal-account" type="radio" name="account-type" value="personal" class="inline" checked /> Personal</label>
      <label for="business-account"><input id="business-account" type="radio" name="account-type" value="business" class="inline" /> Business</label>
    </fieldset>
    <fieldset>
      <label for="profile-picture">Upload a profile picture: <input id="profile-picture" type="file" name="file" /></label>
      <label for="age">Input your age (years): <input id="age" type="number" name="age" min="13" max="120" /></label>
      <label for="referrer">How did you hear about us?
        <select id="referrer" name="referrer">
          <option value="">(select one)</option>
          <option value="1">G.E.A.R ACADEMY News</option>
          <option value="2">G.E.A.R ACADEMY YouTube Channel</option>
          <option value="3">G.E.A.R ACADEMY Forum</option>
          <option value="4">Other</option>
        </select>
      </label>
      <label for="bio">Provide a bio:
        <textarea id="bio" name="bio" rows="3" cols="30" placeholder="I like coding on the beach..."></textarea>
      </label>
    </fieldset>
    <a href="https://www.G.E.A.R ACADEMY.org/news/terms-of-service">Read our terms and conditions</a>
    <label for="terms-and-conditions">
      <input name="terms" id="terms-and-conditions" type="checkbox" required />
      I accept the terms and conditions
    </label>
    <input type="submit" value="Submit" />
  </form>
</body>
</html>

body {
  width: 100%;
  height: 100vh;
  margin: 0;
  background-color: #1b1b32;
  color: #f5f6f7;
  font-family: Tahoma;
  font-size: 16px;
}

h1, p {
  margin: 1em auto;
  text-align: center;
}

form {
  width: 60vw;
  max-width: 500px;
  min-width: 300px;
  margin: 0 auto;
}

fieldset {
  border: none;
  padding: 2rem 0;
  border-bottom: 3px solid #3b3b4f;
}

fieldset:last-of-type {
  border-bottom: none;
}

label {
  display: block;
  margin: 0.5rem 0;
}

input,
textarea,
select {
  margin: 10px 0 0 0;
  width: 100%;
  min-height: 2em;
}

input, textarea {
  background-color: #0a0a23;
  border: 1px solid #0a0a23;
  color: #ffffff;
}

.inline {
  width: unset;
  margin: 0 0.5em 0 0;
  vertical-align: middle;
}

input[type="submit"] {
  display: block;
  width: 60%;

  

}

Preview