为什么我的导航栏在具有相同 CSS 文件和 html 代码的不同页面上表现不同

Question

为什么我的标题和导航在不同的页面上表现不同？我正在尝试制作另一个与主页具有相同导航和标题的页面，但由于某种原因，即使它使用相同的 CSS 文件，它在第二页上的行为也不同。

第1页

<div class="header">
         <div class="container">
            <div class="row d_flex">
               <div class=" col-md-2 col-sm-3 col logo_section">
                  <div class="full">
                     <div class="center-desk">
                        <div class="logo">
                           <a href="index.html"><img src="images/logo.png" alt="#" /></a>
                        </div>
                     </div>
                  </div>
               </div>
               <div class="col-md-8 col-sm-12">
                  <nav class="navigation navbar navbar-expand-md navbar-dark ">
                     <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample04" aria-controls="navbarsExample04" aria-expanded="false" aria-label="Toggle navigation">
                     <span class="navbar-toggler-icon"></span>
                     </button>
                     <div class="collapse navbar-collapse" id="navbarsExample04">
                        <ul class="navbar-nav mr-auto">
                           <li class="nav-item active">
                              <a class="nav-link" href="index.html">Home</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="about.html">About</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="Nike.html">Nike</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="domain.html">adidas</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="contact.html">Contact Us</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="contact.html">Contact Us</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="contact.html">Contact Us</a>
                           </li>
                        </ul>
                     </div>
                  </nav>
               </div>
               <div class="col-md-2  d_none">
                  <ul class="email text_align_right">
                     <li><a href="Javascript:void(0)"> <i class="fa fa-shopping-bag" aria-hidden="true"> <span>0</span></i>
                        </a>
                     </li>
                     <li><a href="Javascript:void(0)">Sign In
                        </a>
                     </li>
                  </ul>
               </div>
            </div>
         </div>
      </div>

第2页

 <div class="header">
         <div class="container">
            <div class="row d_flex">
               <div class=" col-md-2 col-sm-3 col logo_section">
                  <div class="full">
                     <div class="center-desk">
                        <div class="logo">
                           <a href="index.html"><img src="images/logo.png" alt="#" /></a>
                        </div>
                     </div>
                  </div>
               </div>
               <div class="col-md-8 col-sm-12">
                  <nav class="navigation navbar navbar-expand-md navbar-dark ">
                     <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample04" aria-controls="navbarsExample04" aria-expanded="false" aria-label="Toggle navigation">
                     <span class="navbar-toggler-icon"></span>
                     </button>
                     <div class="collapse navbar-collapse" id="navbarsExample04">
                        <ul class="navbar-nav mr-auto">
                           <li class="nav-item active">
                              <a class="nav-link" href="index.html">Home</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="about.html">About</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="Nike.html">Nike</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="domain.html">adidas</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="contact.html">Contact Us</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="contact.html">Contact Us</a>
                           </li>
                           <li class="nav-item">
                              <a class="nav-link" href="contact.html">Contact Us</a>
                           </li>
                        </ul>
                     </div>
                  </nav>
               </div>
               <div class="col-md-2  d_none">
                  <ul class="email text_align_right">
                     <li><a href="Javascript:void(0)"> <i class="fa fa-shopping-bag" aria-hidden="true"> <span>0</span></i>
                        </a>
                     </li>
                     <li><a href="Javascript:void(0)">Sign In
                        </a>
                     </li>
                  </ul>
               </div>
            </div>
         </div>
      </div>

CSS

.header {
     background: transparent;
     width: 100%;
     z-index: 999;
     height: 102px;
     padding: 25px 0;
     position: fixed;
     background-color: #1f2f67;
}

.navigation.navbar {
     float: right;
     padding: 0;
}

.navigation.navbar-dark .navbar-nav .nav-link{
     padding: 0px 25px;
     color: #fff;
     font-size: 17px;
     line-height: 20px;
     font-weight: 400;
     text-transform: uppercase;
}

.navigation.navbar-dark .navbar-nav .nav-link:focus,
.navigation.navbar-dark .navbar-nav .nav-link:hover {
     color: #43eee4;
}

.navigation.navbar-dark .navbar-nav .active>.nav-link,
.navigation.navbar-dark .navbar-nav .nav-link.active,
.navigation.navbar-dark .navbar-nav .nav-link.show,
.navigation.navbar-dark .navbar-nav .show>.nav-link {
     color: #43eee4;
}

我的标题颜色不同，第二页标题不固定