如何重写底部导航默认图标

<ul class="footer-nav">
  <li class="nav-item">
    <a href="#" class="nav-link">
      <i class="icon-home"></i>
      <span>首页</span>
    </a>
  </li>
  <li class="nav-item">
    <a href="#" class="nav-link">
      <i class="icon-profile"></i>
      <span>个人信息</span>
    </a>
  </li>
  <li class="nav-item">
    <a href="#" class="nav-link">
      <i class="icon-settings"></i>
      <span>设置</span>
    </a>
  </li>
</ul>

.footer-nav {
  display: flex;
  justify-content: space-between;
  background-color: #f0f0f0;
  padding: 10px;
}

.nav-item {
  list-style: none;
}

.nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  color: #333;
  text-decoration: none;
}

.nav-link i {
  font-size: 24px;
}

.nav-link span {
  margin-top: 5px;
}

/* 重写图标样式 */
.nav-link i.icon-home:before {
  content: "\f015"; /* 替换为其他合适的图标代码 */
}

.nav-link i.icon-profile:before {
  content: "\f007"; /* 替换为其他合适的图标代码 */
}

.nav-link i.icon-settings:before {
  content: "\f013"; /* 替换为其他合适的图标代码 */
}