我无法在打印预览中更改H1字体大小。尽管其他每个属性都可以使用，但字体大小不起作用。
body{
margin: 1%;
padding:1%;
background-color: rgba(0,0,255,.2);
font-size: 100%;
min-width: 500px;
}
header, footer{
background-color:#0066FF;
padding: 1%;
margin: 1%;
}
header h1{
font-size: 3rem;
color:rgba(0,0,0,.7);;
}
section{
margin:1%;
padding:1%;
}
nav a{
display:block;
background-color: white;
border: 1px solid black;
text-align: center;
border-radius: 35px;
text-decoration: none;
padding: 2%;
margin: 1%;
}
h1{
text-align: center;
color:rgba(255,0,0,.7);;
}
.myClass{
margin: 0em 1em;
padding:.75em;
border: 1px solid black;
border-radius: .25%;
/* Safari and Chrome */
-webkit-column-count:3;
-moz-column-count: 3;
column-count:3;
}
ol{
list-style:upper-roman;
margin:1em;
}
img{
display: none;
}
footer{
clear: both;
text-align:center;
text-transform: uppercase;
}
@media screen and (min-width: 600px) {
img{
display: inline-block;
width: 20%;
margin-right: 4%;
}
section {
display: inline-block;
vertical-align: top;
}
#left {
width: 20%;
}
#center {
width : 70%;
}
#center div:last-of-type{
width: 100%;
padding:.75em;
padding-left: 0;
margin: 0em 1em;
}
h2 {
font-size: 1.7em;
}
h1::after {
content: "(I guess...)";
}
h3 {
height: 35px;
line-height: 35px;
font-size: 1.6em;
font-weight: bolder;
}
#center div p {
height: 45px;
line-height: 45px;
font-size: 1.6em;
}
header , footer {
background-color: initial;
}
footer {
width: 70%;
float: right;
}
footer p {
text-align: left;
}
}
@media print {
nav a {
display:block;
background-color: white;
border: 0;
text-align: center;
border-radius: 0;
text-decoration: none;
padding: 0;
margin: 0;
}
h1 {
font-style: italic;
font-weight: bolder;
font-size: 16px;
}
}<!--
Create a stylesheet that will style the page
as it appears in the example. -->
<!DOCTYPE html>
<html lang="en">
<head>
<title>Responsive Design Lab</title>
<link rel="stylesheet" type="text/css" href="responsive.css"/>
<meta charset = "UTF-8">
</head>
<!-- DO NOT CHANGE ANY PART OF THIS HTML CODE!!! -->
<header>
<h1> Web Design is Awesome!!!</h1>
<nav>
<a href="http://www.umich.edu/">University of Michigan</a>
<a href="http://www.intro-webdesign.com/">Intro to Web Design</a>
</nav>
</header>
<footer>
<p>Sample code for Responsive Design .<br/> Colleen van Lent</p>
</footer>
<!-- DO NOT CHANGE ANY PART OF THIS HTML CODE!!! -->
</body>
</html>尝试使用em，px或一个百分点。
h1 {
font-size: 24px;
font-size: 200%;
font-size: 1.5em;
}
百分比将取决于默认文本大小是什么。通常默认大小为16px。
我面临着同样的问题。事实证明，对我而言。
尝试将CSS用于打印模式：
@media print{
h1{....}
}
您可以添加！