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我想覆盖子元素中的父 css。 我想给父元素加下划线，而不是给子元素加下划线。
.parent {
text-decoration: underline;
color: red;
}
.child {
color: green;
text-decoration: none !important;
}
.sub-child {
color: green;
text-decoration: none !important;
}<div class="parent">Inside parent
<div class="child">Inside first child
<div class="sub-child">Inside 1st child of 1st child
</div>
</div>
<div class="child">Inside 2nd child
<div class="sub-child">Inside 1st child of 2nd child</div>
<div class="sub-child">Inside 2nd child of 2nd child</div>
</div>
<div class="child">
Inside 3rd child
<div class="sub-child">Insde 1st child of 3rd child</div>
</div>
</div>