我最近收到了一些帮助，修复了我的页脚位于页面中间的问题(非常感谢！(，但看起来我有另一个问题-我的页眉中的照片(本应居中并修复(现在更向左，当我滚动页面时会移动：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset= "utf-8">
<Title>Contact</Title>
<link rel="stylesheet" href="contact3.css">
</head>
<body>
<header>
<nav>
<ul>
<!-- list item one -->
<li>
<a href="auto2.html">Home</a>
</li>
<!-- list item two -->
<li>
<a href="aboutauto2.html">About</a>
</li>
<!-- list item three -->
<li>
<a href="service3.html">Services</a>
</li>
<!-- list item four -->
<li>
<a href="contact3.html">Contact</a>
</li>
</ul>
</nav>
<img src="CG1.svg" alt-text="Collision Guru Logo" width=250px height=80px class="center">
</header>
<h1> Contact Us</h1><div class="form-container">
<div class="form-container">
<img src="yellow car headlight collision.jpg" width=450px height=400px class="carimg">
<form action="C:Userselizabeth.sweeneyDownloadsform_data.php" method="post">
<label for="fname">First name:</label><br>
<input type="text" id="fname" name="fname"> <br>
<label for="lname">Last name:</label><br>
<input type="text" id="lname" name="lname">
<label for="email">Email:</label><br>
<input type="email" id="email" name="email"><br>
<label for="phone">Phone:</label><br>
<input type="phone" id="phone" name="phone">
<br>
<input type="checkbox" id="option1" name="option1" value="Paint">
<label for="option1"> Paint Job</label><br>
<input type="checkbox" id="option2" name="option2" value="Body">
<label for="option2"> Body Work</label><br>
<input type="checkbox" id="option3" name="option3" value="Clean">
<label for="option3"> Cleaning</label><br>
<div class="submitbutton">
<input type="submit" value="Submit"></div>
</form>
</div>
<footer>
<nav>
<div class="contactinfo">
440-555-6893 • <a href="mike.tarescavage@gmail.com"> mike.tarescavage@gmail.com</a>
</div>
<div class="sociallinks">
<img src= "facebook-icon.png" width=30px height=30px> <a href="https://www.instagram.com/collision_guru"><img src= "IG-icon-2.png" width=30px height=30px></a>
</div>
</nav>
</footer>
</body>
</html>
CSS：
body {
margin: 0;
background: #ffffff;
font-family: century gothic;
font-size: 18px;
text-align: center;
padding-bottom: 40px;
}
header {
background: #000000;
height: 125px;
color: #ffffff;
}
a{
color: #ffffff;
text-decoration: none;
}
ul{
margin: 0;
padding: 0px;
/*this option by default dispose the elements in a row (flex-direction: row)*/
display: flex;
}
li{
list-style-type: none;
/*when I specify 2 values to margin, the first one is for the top and bottom side, the second for the left and right side*/
margin: 0 1vw;
}
.center {
display: block;
margin-left: auto;
margin-right: auto;
margin-bottom: 20px;
width: 50%;
top: 20px;
position: fixed;
}
h1 {
text-align: center;
font-family: century gothic;
font-size: 60px;
font-weight: bold;
color: #000000;
}
.form-container {
overflow: hidden;
}
form
{
float: right;
margin-right: 75px;
text-align: left;
display: inline-block;
}
input[type=text], select {
width: 100%;
text-align:left;
padding: 12px 20px;
margin: 8px 0;
margin-left: 30px;
display: inline-block;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
margin-right: 50px;
}
input[type=email], select {
width: 100%;
text-align:left;
padding: 12px 20px;
margin: 8px 0;
margin-left: 30px;
display: inline-block;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
margin-right: 50px;
}
input[type=phone], select {
width: 100%;
text-align:left;
padding: 12px 20px;
margin: 8px 0;
margin-left: 30px;
display: inline-block;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
margin-right: 50px;
}
input[type=checkbox] {
text-align: left;
display: in-line block;
margin-left: 30px;
}
.submitbutton {
text-align: center;
padding-left: 80px;
display: block;
}
input[type=submit] {
width: 75%;
margin-left: 30px;
background-color: #000000;
color: white;
padding: 12px 20px;
padding-left: 30px;
margin: 8px 0;
border: none;
border-radius: 4px;
cursor: pointer;
display: in-line block;
}
.carimg {
float: left;
margin-left: 50px;
padding-bottom: 90px;
}
footer {
background: #000000;
height: 125px;
color: #ffffff;
}
.footerlinks {
float: left;
word-spacing: 30px;
text-align: left;
padding-top: 50px;
margin-left: 20px;
}
.contactinfo {
display: block;
margin-left: auto;
margin-right: auto;
width: 50%;
text-align: center;
padding-top: 50px;
}
.sociallinks {
float: right;
margin-right: 40px;
word-spacing: 20px;
}
这是在添加表单容器类之后发生的——不确定这是否与它有关，或者可能需要对照片采取另一个步骤？还是完全无关。
请告诉我你的想法。
谢谢！：(
如果你想让你的徽标在滚动时固定在顶部中心，那么将css更新为：
.center {
display: block;
margin-bottom: 20px;
width: 50%;
top: 20px;
left: 50%;
transform: translateX(-50%);
position: fixed;
}
但是，如果您希望它只位于页眉的中心，那么您只需要从徽标中删除"center"类。
您将display: fixed;应用于.center类，这将导致页眉中的img元素随滚动条移动。从img元素中删除class="center"属性可以解决滚动问题，但现在您的图像位于原来位置的右侧。