我正在尝试使用CSS3实现对标题的悬停效果的淡化，但没有成功。我不确定我做错了什么因为我很确定我遵循了W3学校的教程。
你可以帮我修复代码，这样我就可以为我的标题留下悬停效果吗？我正在尝试应用悬停效果的类是.lesson-title，h1。
这意味着它适用于那些名称为“识别您的商业机会”“测试您的概念或产品”等的标题，等等。
它们也是链接，因此您也可以将悬停效果应用于它们作为另一种选择。
这是代码：
<html>
<head>
<style>
.cm-lessons {
background: #cecece;
padding: 2em;
max-width: 3000px;
margin: auto;
}
.cm-lessons h1{
font-size: 1.7em;
color: #00455e;
}
.cm-lessons ol, ul {
list-style: none;
}
.cm-lesson-marker span, ol, ul, li {
margin: 0;
padding-bottom: 30px;
border: 0;
font-size: 100%;
color: #00455e;
vertical-align: baseline;
border-bottom: 1px solid #00455e;
}
.last-lesson{
margin: 0;
padding-bottom: 30px;
font-size: 100%;
color: #00455e;
vertical-align: baseline;
border: none;
}
.cm-lesson-marker h1{
font-size: 3em;
}
#more-lessons{
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
}
.lesson-title h1, h2, h3, u, ul{
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
vertical-align: baseline;
color: #00455e;
opacity: 1;
transition: 0.3s;
-webkit-transition: 170ms ease-in-out;
-moz-transition: 170ms ease-in-out;
-ms-transition: 170ms ease-in-out;
-o-transition: 170ms ease-in-out;
transition: 170ms ease-in-out;
transition-duration: 170ms;
transition-timing-function: ease-in-out;
transition-delay: 0s;
}
.lesson-title h1:hover{
opacity: 0.2;
transition: 0.3s;
-webkit-transition: 170ms ease-in-out;
-moz-transition: 170ms ease-in-out;
-ms-transition: 170ms ease-in-out;
-o-transition: 170ms ease-in-out;
transition: 170ms ease-in-out;
transition-duration: 170ms;
transition-timing-function: ease-in-out;
transition-delay: 0s;
}
ol, ul {
list-style: none;
}
.collapsible {
text-align: center;
color: #00455e;
cursor: pointer;
padding: 30px;
width: 100%;
font-size: 15px;
opacity: 1;
background-color: transparent;
border: none;
}
.active, .collapsible:hover {
opacity: 0.3;
}
</style>
</head>
<div>
<ul class="cm-lessons">
<h1>
For First-Time Business Owners
</h1>
<h3>
Lesson plans: 8
</h3>
<h2 class="lesson-title">
One hour webinar over a duration of 8 weeks.
</h2>
<li class="cm-lesson">
<span class="cm-lesson-marker">
<h1>01</h1>
</span>
<a href="http://www.yantern.com/webinar001-01">
<h1 class="lesson-title">Identify Your Business Opportunity</h1>
</a>
<p>Choosing what kind of business to start with can be a challenging task when confronted with many ideas and opportunities. It’s important to determine where your passions lie and to understand what it takes to start the business. You have to consider your skills and resources. The industry you are entering may be dying or a fast-growing and emerging business.</p>
</li>
<li class="cm-lesson">
<span class="cm-lesson-marker">
<h1>02</h1>
</span>
<a href="http://www.yantern.com/webinar001-02">
<h1 class="lesson-title">Test Your Concept or Product</h1>
</a>
<p>Concept testing is the process of evaluating likely customer response to a product idea prior to its introduction into the market. Seen through a jobs-to-be-done lens, the goal of concept testing is to validate that a product concept is better than the competing solutions at helping customers to get a job done.</p>
</li>
<li class="cm-lesson">
<span class="cm-lesson-marker"><h1>03</h1></span>
<a href="http://www.yantern.com/webinar001-03">
<h1 class="lesson-title">Name Your Business</h1>
</a>
<p>Naming your business is important. The right business name will help you distinguish you from a sea of bland competitors, hence provide your customers with a reason to remember and use your company. </p>
</li>
<li class="cm-lesson">
<span class="cm-lesson-marker">
<h1>04</h1>
</span>
<a href="http://www.yantern.com/webinar001-04">
<h1 class="lesson-title">Build a Business Plan</h1>
</a>
<p>For any start-ups, a business plan is an important tool and it also allows you to gain a better understanding of your industry structure, competitive landscape and the capital requirements of starting the small business. The plan lays out a vision of growth and the steps needed to get there.
</p>
</li>
<button class="collapsible">More lessons</button>
<div id="more-lessons">
<li class="cm-lesson">
<span class="cm-lesson-marker">
<h1>05</h1>
</span>
<a href="http://www.yantern.com/webinar001-05">
<h1 class="lesson-title">Find Start-Up Money</h1>
</a>
<p>To start a business, you must invest in the business. The journey of finding start-up funds will be different for each individual. Some businesses require small amount or large amount of money to start. Finding the money you need may come from a source you would have never thought of.
</p>
</li>
<li class="cm-lesson">
<span class="cm-lesson-marker"><h1>06</h1></span>
<a href="http://www.yantern.com/webinar001-06">
<h1 class="lesson-title">Choose a Business Structure</h1>
</a>
<p>Deciding on the structure of your business is not a decision to be taken lightly. Whether you have the LLC, a sole proprietorship or form a corporation; your choice will have an impact on your business liability and taxes. </p>
</li>
<li class="cm-lesson">
<span class="cm-lesson-marker">
<h1>07</h1>
</span>
<a href="http://www.yantern.com/webinar001-07">
<h1 class="lesson-title">Get Your Business Licenses and Permits</h1>
</a>
<p>Depending on your chosen business structure, may need to register your business with the state authorities. Setting up your small business may require an employer identification number (EIN) which is also used by state taxing authorities to identify businesses. Additional paperwork can entail sales tax licenses and zoning permits. </p>
</li>
<li class="cm-lesson last-lesson">
<span class="cm-lesson-marker">
<h1>08</h1>
</span>
<a href="http://www.yantern.com/webinar001-08">
<h1 class="lesson-title">Get Business Insurance</h1>
</a>
<p>As a new small business owner, you have the responsibility to manage the risks associated with your business. Don't put your new startup at risk without getting the proper small business insurance to protect your company in the event of a disaster or litigation.</p>
</li>
</ul>
</div>
</div>
<script>
var coll = document.getElementsByClassName("collapsible");
var i;
for (i = 0; i < coll.length; i++) {
coll[i].addEventListener("click", function() {
this.classList.toggle("active");
var content = this.nextElementSibling;
if (content.style.maxHeight){
content.style.maxHeight = null;
} else {
content.style.maxHeight = content.scrollHeight + "px";
}
});
}
</script>
</html>它将需要保持HTML格式，因为我将其复制/粘贴到拖放式网站编辑器中。对不起凌乱的代码。
谢谢！如果您需要更多详细信息，请回复我。
我认为你的标签错了：
.lesson-title h1:hover{
opacity: 0.2;
transition: 0.3s;
-webkit-transition: 170ms ease-in-out;
-moz-transition: 170ms ease-in-out;
-ms-transition: 170ms ease-in-out;
-o-transition: 170ms ease-in-out;
transition: 170ms ease-in-out;
transition-duration: 170ms;
transition-timing-function: ease-in-out;
transition-delay: 0s;
}
应该
h1.lesson-title:hover{
opacity: 0.2;
transition: 0.3s;
-webkit-transition: 170ms ease-in-out;
-moz-transition: 170ms ease-in-out;
-ms-transition: 170ms ease-in-out;
-o-transition: 170ms ease-in-out;
transition: 170ms ease-in-out;
transition-duration: 170ms;
transition-timing-function: ease-in-out;
transition-delay: 0s;
}
原始选择器意味着悬停在h1上，它是.lesson-title的子节点。
而你想要说的是悬停在h1上，它有类.lesson-title。
希望有所帮助！
超级简单：从class="lesson-title"标签（和<h1> CSS）中删除你的.lesson-title h1:hover。然后它工作（见下文）。
h1:hover{
opacity: 0.2;
transition: 0.3s;
-webkit-transition: 170ms ease-in-out;
-moz-transition: 170ms ease-in-out;
-ms-transition: 170ms ease-in-out;
-o-transition: 170ms ease-in-out;
transition: 170ms ease-in-out;
transition-duration: 170ms;
transition-timing-function: ease-in-out;
transition-delay: 0s;
} <li class="cm-lesson">
<span class="cm-lesson-marker">
<h1>02</h1>
</span>
<a href="http://www.yantern.com/webinar001-02">
<h1>Test Your Concept or Product</h1>
</a>
<p>Concept testing is the process of evaluating likely customer response to a product idea prior to its introduction into the market. Seen through a jobs-to-be-done lens, the goal of concept testing is to validate that a product concept is better than the competing solutions at helping customers to get a job done.</p>
</li>