怎么用:first-child查到两个p元素，分别字体大小为70px和35px

Question

  <div class="login_bg">
      <!-- 背景图 -->
      <div class="login_bgimg" style="z-index: -1;">
         <img src="../assets/images/background_phone.jpg" alt="">
      </div>
      <div class="login_main" style="z-index: 100;">
         <div class="login_main_header">
           <router-link to="./Login.vue"><img src="../assets/images/left_back.png" alt=""></router-link>
            <p class="p1">期待您的登录</p>
            <p class="p2">每天都能和不同的小伙伴讨论不同的美食</p>
         </div>
 </div>
 </div>

Answer 1

      p:nth-child(1){
        font-size: 70px;
      }
      p:nth-child(2){
        font-size: 35px;
      }