我找不到解决方案-一切看起来都正确，并且我尝试过验证代码。没问题。当我将样式应用于每个<p>（没有选择器）时，它会很好显示。当我使用选择器时，什么都没有。当我将选择器移到<style>标签顶部时，所有样式都会消失。很明显，我缺少了一些东西，这些选择器在某种程度上是错误的。有什么帮助吗？
p.indented{
margin-left: 3em;
}
p#borderParagraph{
border: 6px double black;
border-radius: 20px;
text-align: center;
padding: .75em;
}<p class=“indented”>Ut enim ad minim venom, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consquat. Luis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.</p>
<p id=“borderParagraph”>Ut enim ad minim venom, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consquat. Luis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. </p>这是因为您使用”而不是"或'
<style>
p.indented{
margin-left: 3em;
}
p#borderParagraph{
border: 6px double black;
border-radius: 20px;
text-align: center;
padding: .75em;
}
</style>
<h3>Works</h3>
<p class="indented">Ut enim ad minim venom, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consquat. Luis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.</p>
<p id='borderParagraph'>Ut enim ad minim venom, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consquat. Luis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. </p>
<h3>Not working</h3>
<p class=”indented”>Ut enim ad minim venom, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consquat. Luis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.</p>本文收集自互联网，转载请注明来源。
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