响应式网页设计：屏幕宽度较小时如何实现文本居中对齐

你的问题出在：当前仅在屏幕宽度≤1201px时，给.index-first-text设置了align-items:center（让容器内的元素块居中），但文本内容默认是左对齐的，当屏幕宽度继续缩小到615px以下时，文本内容的左对齐会让视觉上看起来没有居中。

修改方案 #

只需给小屏幕下的文本元素添加text-align:center，让文本内容本身居中，同时确保容器的居中属性持续生效：

1. 在现有的@media screen and (max-width: 1201px)媒体查询中，补充文本对齐样式：

@media screen and (max-width: 1201px) {
  .navbar {
    flex-direction: column;
    align-items: center;
    padding: 10px;
  }

  .navbar h1 {
    margin-top: 10px;
    font-size: 30px;
  }

  .menu {
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 30px;
    margin-left: 10px;
  }

  .menu li {
    padding: 10px 20px;
  }

  .index-first-text {
    align-items: center;
    margin: 50px;
  }
  /* 新增：让文本内容居中 */
  .index-first-text p,
  .index-first-text h4 {
    text-align: center;
  }
}

2. （可选）如果要适配615px以下的极小屏幕，可以额外添加媒体查询，调整边距：

@media screen and (max-width: 615px) {
  .index-first-text {
    margin: 50px 20px;
  }
}

修改后的完整代码 #

<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>MedConnect User | Home</title>
  <style media="screen">
    @import url('https://fonts.googleapis.com/css2?family=Lora&display=swap');

    body {
      background-color: #f8d4a4;
      font-family: Lora;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    a {
      text-decoration: none;
    }

    li {
      list-style: none;
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-around;
      padding: 20px;
      margin-top: 50px;
    }

    .nav-links h3 {
      color: #704a1b;
    }

    .head {
      font-size: 32px;
      color: #614124;
      margin-top: -20px;
      margin-left: 50px;
      cursor: pointer;
    }

    .menu {
      display: flex;
      gap: 1em;
      font-size: 18px;
      margin-left: 280px;
    }

    .menu li {
      padding: 5px 12px;
      cursor: pointer;
    }

    .profile-btn {
      border-radius: 5px;
      box-shadow: 0 1px 1px black;
      padding: 10px 10px;
      margin-top: -10px;
      background-color: #60a159;
    }

    .profile-btn:active {
      box-shadow: none;
    }

    @media screen and (max-width: 1201px) {
      .navbar {
        flex-direction: column;
        align-items: center;
        padding: 10px;
      }

      .navbar h1 {
        margin-top: 10px;
        font-size: 30px;
      }

      .menu {
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 30px;
        margin-left: 10px;
      }

      .menu li {
        padding: 10px 20px;
      }

      .index-first-text {
        align-items: center;
        margin: 50px;
      }
      .index-first-text p,
      .index-first-text h4 {
        text-align: center;
      }
    }

    .index-first p {
      color: #614124;
      font-size: 40px;
    }

    .index-first h4 {
      color: #704a1b;
      font-size: 20px;
    }

    .index-first-text {
      margin: 130px 120px;
      display: flex;
      flex-direction: column;
      gap: 2em;
    }

    .consult-today-btn {
      border-radius: 5px;
      box-shadow: 0 1px 1px black;
      padding: 25px 25px;
      background-color: #60a159;
      width: 176px;
      cursor: pointer;
      margin-top: 20px;
    }

    .consult-today-btn:active {
      box-shadow: none;
    }

    @media screen and (max-width: 790px) {
      .index-first-text p {
        font-size: 30px;
      }

      .index-first-text h4 {
        font-size: 15px;
      }
    }

    @media screen and (max-width: 615px) {
      .index-first-text {
        margin: 50px 20px;
      }
    }

  </style>
</head>
<body>

<nav class="navbar">
  <h1 class="head">MedConnect</h1>

  <ul class="nav-links">
    <div class="menu">
      <li><h3>Consult</h3></li>
      <li><h3>Resources</h3></li>
      <li><h3>About</h3></li>
      <li><h3>Contact</h3></li>
      <li><h3 class="profile-btn" style="color: white;">Your Profile</h3></li>
    </div>
  </ul>
</nav>

<div class="index-first">
  <div class="index-first-text">
    <p><b>Get Remote Medical Assistance here.</b></p>
    <h4>Find, Consult, Connect and Personalise your Needs Today.</h4>
    <h3 class="consult-today-btn" style="color: white;">Consult Today</h3>
  </div>
</div>

</body>
</html>

内容的提问来源于stack exchange，提问作者user17999474