header.php

<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-dark role-navgation d-print">
  <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#kirikae" aria-label="navi">
    <span class="navbar-toggler-icon">
    </span>
  </button>
  <div class="collapse navbar-collapse" id="kirikae">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="home.html">現在の空き情報
        </a>
      </li>
      <li class="nav-item active">
        <a class="nav-link" href="zisaku-print.html">Contact us
        </a>
      </li>
    </ul>
  </div>
  <div class="collapse navbar-collapse" id="navbarText">
    <span class="navbar-text ml-auto">市営体育館の開放種目をリアルタイムに表示するサイト
    </span>
  </div>
  <a class="navbar-brand" href="home.html">
    <img src="img/pin_icon.png" alt="" width="30" height="30">GymFinder
  </a>
</nav>