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---
id: 60ffe7d8aae62c05bcc9e7eb
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title: 步驟 56
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challengeType: 0
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dashedName: step-56
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---
# --description--
將 `display` 設置爲 `block` ,提交按鈕與父按鈕的左邊緣齊平。
使用與使 `form` 居中相同的技術來居中提交按鈕。
# --hints--
你應該爲提交按鈕提供 `0 auto` 的 `margin` 。
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('input[type="submit"]')?.margin, '0px auto');
```
你不應該給提交按鈕一個 `min-width` 或 `max-width` 。
```js
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('input[type="submit"]')?.minWidth);
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('input[type="submit"]')?.maxWidth);
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
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< html lang = "en" >
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< head >
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< meta charset = "UTF-8" >
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< title > Registration Form< / title >
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< link rel = "stylesheet" href = "styles.css" / >
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< / head >
< body >
< h1 > Registration Form< / h1 >
< p > Please fill out this form with the required information< / p >
< form action = 'https://register-demo.freecodecamp.org' >
< fieldset >
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< 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 >
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< / fieldset >
< fieldset >
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< label for = "personal-account" > < input id = "personal-account" type = "radio" name = "account-type" class = "inline" / > Personal Account< / label >
< label for = "business-account" > < input id = "business-account" type = "radio" name = "account-type" class = "inline" / > Business Account< / label >
< label for = "terms-and-conditions" name = "terms-and-conditions" >
< input id = "terms-and-conditions" type = "checkbox" required name = "terms-and-conditions" class = "inline" / > I accept the < a href = "https://www.freecodecamp.org/news/terms-of-service/" > terms and conditions< / a >
< / label >
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< / fieldset >
< fieldset >
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< 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" >
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< option value = "" > (select one)< / option >
< option value = "1" > freeCodeCamp News< / option >
< option value = "2" > freeCodeCamp YouTube Channel< / option >
< option value = "3" > freeCodeCamp Forum< / option >
< option value = "4" > Other< / option >
< / select >
< / label >
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< label for = "bio" > Provide a bio:
< textarea id = "bio" name = "bio" rows = "3" cols = "30" placeholder = "I like coding on the beach..." > < / textarea >
< / label >
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< / fieldset >
< input type = "submit" value = "Submit" / >
< / form >
< / body >
< / html >
```
```css
body {
width: 100%;
height: 100vh;
margin: 0;
background-color: #1b1b32 ;
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color: #f5f6f7 ;
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font-family: Tahoma;
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font-size: 16px;
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}
h1, p {
margin: 1em auto;
text-align: center;
}
form {
width: 60vw;
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max-width: 500px;
min-width: 300px;
margin: 0 auto;
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}
fieldset {
border: none;
padding: 2rem 0;
border-bottom: 3px solid #3b3b4f ;
}
fieldset:last-of-type {
border-bottom: none;
}
label {
display: block;
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margin: 0.5rem 0;
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}
input,
textarea,
select {
margin: 10px 0 0 0;
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width: 100%;
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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;
}
--fcc-editable-region--
input[type="submit"] {
display: block;
width: 60%;
}
--fcc-editable-region--
```