css中怎么给字体加粗

<p>这是普通文本</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p><p><strong>这是加粗文本</strong></p>

p {  font-weight: normal;}strong {  font-weight: bold;}

p {  font-weight: 600;}