html - 固定位置导致我的标题被推到右边
问题描述
当我没有固定它时,我的标题会占据其容器的整个宽度。
html {
font-size: 32px;
}
body {
text-align: center;
}
header {
display: flex;
justify-content: center;
align-items: center;
font-size: 2.25rem;
padding: 0.625rem;
border-bottom: 3px solid black;
font-family: 'Cinzel Decorative', cursive;
}
nav {
font-family: 'IM Fell French Canon SC', serif;
text-align: right;
flex-grow: 1;
font-size: 1rem;
}
当我修复我的标题时,它的右侧会被推出页面:
header {
display: flex;
justify-content: center;
align-items: center;
font-size: 2.25rem;
padding: 0.625rem;
position:fixed;
width: 100%;
z-index: 10;
border-bottom: 3px solid black;
font-family: 'Cinzel Decorative', cursive;
}
有没有其他适当的方法可以做到这一点,而无需在右侧添加填充以抵消更改?
HTML 代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://fonts.googleapis.com/css2?family=Cinzel+Decorative:wght@700&family=IM+Fell+French+Canon+SC&display=swap" rel="stylesheet">
<link href="normalize.css" rel="stylesheet" />
<link href="style.css" rel="stylesheet" />
<title>Watch iT</title>
</head>
<body>
<!-- Header Section -->
<header>
<span id="logo">W</span>
<nav>
<span><a href="#">About</a></span>
<span><a href="#">Products</a></span>
<span><a href="#">Contact</a></span>
</nav>
</header>
</body>
</html>
解决方案
使用 时position: fixed
,该元素会从正常的文档流中移除,并且不会在页面布局中为该元素创建空间。它相对于视口建立的初始包含块定位。
如果您指定
width:100%
,则元素的总宽度将是其包含块的 100% 加上任何水平边距、填充和边框(除非您使用了 box-sizing:border-box,在这种情况下,只有边距被添加到 100% 到更改其总宽度的计算方式)。
width: 100%
和position: fixed
on 的组合header
是导航菜单项溢出 flex 容器中页面右侧的原因。这是因为width: 100%
允许内容大于其包含块和溢出。如果您添加box-sizing: border-box;
到页面,则溢出问题得到解决。此外,您可以为固定位置容器设置 atop
和left
position 以指定距元素包含块边缘的偏移量。
*,
*::before,
*::after {
box-sizing: border-box;
}
html {
font-size: 32px;
}
body {
text-align: center;
}
header {
display: flex;
justify-content: center;
align-items: center;
font-size: 2.25rem;
padding: 0.625rem;
position:fixed;
top: 0;
left: 0;
width: 100%;
z-index: 10;
border-bottom: 3px solid black;
font-family: 'Cinzel Decorative', cursive;
}
nav {
font-family: 'IM Fell French Canon SC', serif;
text-align: right;
flex-grow: 1;
font-size: 1rem;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://fonts.googleapis.com/css2?family=Cinzel+Decorative:wght@700&family=IM+Fell+French+Canon+SC&display=swap" rel="stylesheet">
<link href="normalize.css" rel="stylesheet" />
<link href="style.css" rel="stylesheet" />
<title>Watch iT</title>
</head>
<body>
<!-- Header Section -->
<header>
<span id="logo">W</span>
<nav>
<span><a href="#">About</a></span>
<span><a href="#">Products</a></span>
<span><a href="#">Contact</a></span>
</nav>
</header>
</body>
</html>