---
id: 6148e161ecec9511941f8833
title: ステップ 64
challengeType: 0
dashedName: step-64
---

# --description--

今はテキストが読みにくくなっています。 `footer` とその中のアンカー要素を選択し、フォントの色を設定して適切なコントラスト比をもたせてください。

# --hints--

`footer, footer a` セレクターを使用する必要があります。

```js
const gs = (s) => new __helpers.CSSHelp(document).getStyle(s);
assert.exists(gs('footer, footer a') || gs('footer a, footer'));
```

`color` の値を、少なくとも `7:1` のコントラスト比をもたせるように設定する必要があります。 _ヒント: `#dfdfe2` をお勧めします_

```js
function luminance(r, g, b) {
    const a = [r, g, b].map((v) => {
        v /= 255;
        return v <= 0.03928 ? v / 12.92 : Math.pow( (v + 0.055) / 1.055, 2.4 );
    });
    return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;
}
function contrast(rgb1, rgb2) {
    const lum1 = luminance(rgb1[0], rgb1[1], rgb1[2]);
    const lum2 = luminance(rgb2[0], rgb2[1], rgb2[2]);
    const brightest = Math.max(lum1, lum2);
    const darkest = Math.min(lum1, lum2);
    return (brightest + 0.05)
         / (darkest + 0.05);
}
const backgroundColour = [42, 42, 64];

const foot = getComputedStyle(document.querySelector('footer'))?.color;
const a = getComputedStyle(document.querySelector('footer a'))?.color;

const rgbFoot = foot?.match(/(\d+),\s(\d+),\s(\d+)/);
const rgbA = a?.match(/(\d+),\s(\d+),\s(\d+)/);
const footColour = [rgbFoot[1], rgbFoot[2], rgbFoot[3]];
const aColour = [rgbA[1], rgbA[2], rgbA[3]];
assert.isAtLeast(contrast(backgroundColour, footColour), 7);
assert.isAtLeast(contrast(backgroundColour, aColour), 7);
```

# --seed--

## --seed-contents--

```html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="freeCodeCamp Accessibility Quiz practice project" />
    <title>Accessibility Quiz</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <header>
      <img id="logo" src="https://cdn.freecodecamp.org/platform/universal/fcc_primary.svg">
      <h1>HTML/CSS Quiz</h1>
      <nav>
        <ul>
          <li><a href="#student-info">INFO</a></li>
          <li><a href="#html-questions">HTML</a></li>
          <li><a href="#css-questions">CSS</a></li>
        </ul>
      </nav>
    </header>
    <main>
      <form method="post" action="https://freecodecamp.org/practice-project/accessibility-quiz">
        <section role="region" aria-labelledby="student-info">
          <h2 id="student-info">Student Info</h2>
          <div class="info">
            <label for="student-name">Name:</label>
            <input type="text" name="student-name" id="student-name" />
          </div>
          <div class="info">
            <label for="student-email">Email:</label>
            <input type="email" name="student-email" id="student-email" />
          </div>
          <div class="info">
            <label for="birth-date">D.O.B.<span class="sr-only">(Date of Birth)</span></label>
            <input type="date" name="birth-date" id="birth-date" />
          </div>
        </section>
        <section role="region" aria-labelledby="html-questions">
          <h2 id="html-questions">HTML</h2>
          <div class="question-block">
            <p>1</p>
            <fieldset class="question" name="html-question-one">
              <legend>
                The legend element represents a caption for the content of its
                parent fieldset element
              </legend>
              <ul class="answers-list">
                <li>
                  <label for="q1-a1">
                    <input type="radio" id="q1-a1" name="q1" value="true" />
                    True
                  </label>
                </li>
                <li>
                  <label for="q1-a2">
                    <input type="radio" id="q1-a2" name="q1" value="false" />
                    False
                  </label>
                </li>
              </ul>
            </fieldset>
          </div>
          <div class="question-block">
            <p>2</p>
            <fieldset class="question" name="html-question-two">
              <legend>
                A label element nesting an input element is required to have a
                for attribute with the same value as the input's id
              </legend>
              <ul class="answers-list">
                <li>
                  <label for="q2-a1">
                    <input type="radio" id="q2-a1" name="q2" value="true" />
                    True
                  </label>
                </li>
                <li>
                  <label for="q2-a2">
                    <input type="radio" id="q2-a2" name="q2" value="false" />
                    False
                  </label>
                </li>
              </ul>
            </fieldset>
          </div>
        </section>
        <section role="region" aria-labelledby="css-questions">
          <h2 id="css-questions">CSS</h2>
          <div class="formrow">
            <div class="question-block">
              <label for="customer">Are you a frontend developer?</label>
            </div>
            <div class="answer">
              <select name="customer" id="customer" required>
                <option value="">Select an option</option>
                <option value="yes">Yes</option>
                <option value="no">No</option>
              </select>
            </div>
            <div class="question-block">
              <label for="css-questions">Do you have any questions:</label>
            </div>
            <div class="answer">
              <textarea id="css-questions" name="css-questions" rows="5" cols="24" placeholder="Who is flexbox..."></textarea>
            </div>
          </div>
        </section>
        <button type="submit">Send</button>
      </form>
    </main>
    <footer>
      <address>
        <a href="https://freecodecamp.org">freeCodeCamp</a><br />
        San Francisco<br />
        California<br />
        USA
      </address>
    </footer>
  </body>
</html>

```

```css
body {
  background: #f5f6f7;
  color: #1b1b32;
  font-family: Helvetica;
  margin: 0;
}

header {
  width: 100%;
  height: 50px;
  background-color: #1b1b32;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 0;
}

#logo {
  width: max(100px, 18vw);
  background-color: #0a0a23;
  aspect-ratio: 35 / 4;
  padding: 0.4rem;
}

h1 {
  color: #f1be32;
  font-size: min(5vw, 1.2em);
  text-align: center;
}

nav {
  width: 50%;
  max-width: 300px;
  height: 50px;
}

nav > ul {
  display: flex;
  justify-content: space-evenly;
  flex-wrap: wrap;
  align-items: center;
  padding-inline-start: 0;
  margin-block: 0;
  height: 100%;
}

nav > ul > li {
  color: #dfdfe2;
  margin: 0 0.2rem;
  padding: 0.2rem;
  display: block;
}

nav > ul > li:hover {
  background-color: #dfdfe2;
  color: #1b1b32;
  cursor: pointer;
}

li > a {
  color: inherit;
  text-decoration: none;
}

main {
  padding-top: 50px;
}

section {
  width: 80%;
  margin: 0 auto 10px auto;
  max-width: 600px;
}

h1,
h2 {
  font-family: Verdana, Tahoma;
}

h2 {
  border-bottom: 4px solid #dfdfe2;
  margin-top: 0px;
  padding-top: 60px;
}

.info {
  padding: 10px 0 0 5px;
}

.formrow {
  margin-top: 30px;
  padding: 0px 15px;
}

input {
  font-size: 16px;
}

.info label, .info input {
  display: inline-block;
}

.info input {
  width: 50%;
  text-align: left;
}

.info label {
  width: 10%;
  min-width: 55px;
  text-align: right;
}

.question-block {
  text-align: left;
  display: block;
  width: 100%;
  margin-top: 20px;
  padding-top: 5px;
}

p {
  margin-top: 5px;
  padding-left: 15px;
  font-size: 20px;
}

p::before {
  content: "Question #";
}

.question {
  border: none;
  padding-bottom: 0;
}

.answers-list {
  list-style: none;
  padding: 0;
}

button {
  display: block;
  margin: 40px auto;
  width: 40%;
  padding: 15px;
  font-size: 23px;
  background: #d0d0d5;
  border: 3px solid #3b3b4f;
}

footer {
  background-color: #2a2a40;
  display: flex;
  justify-content: center;
}

--fcc-editable-region--

--fcc-editable-region--

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

```
