Header does not display the same for friend as does for me on desktop

/* body style */

@-ms-viewport {
  width: device-width;
}

body {
  background: rgba(0, 0, 0, 0.05);
  color: #000000;
  font-family: "Source Sans Pro", "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif !important;
}

/* Add a black background color to the top navigation */

.topnav {
  background-color: #FFF;
  overflow: hidden;
}


/* Style the links inside the navigation bar */

.topnav a {
  float: right;
  display: block;
  color: #333;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
  line-height: 25px;
  overflow: hidden;
}


/* Add an active class to highlight the current page */

.active {
  background-color: #fde402;
  color: #ed1010 !important;
  text-decoration: none !important;
}

/* Dropdown container - needed to position the dropdown content */

.dropdown {
  float: right;
  overflow: hidden;
}


/* Style the dropdown button to fit inside the topnav */

.dropdown .dropbtn {
  font-size: 17px;
  border: none;
  outline: none;
  color: #333;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}
/* Style the links inside the dropdown */

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}


/* Add a dark background on topnav links and the dropdown button on hover */

.topnav a:hover,
.dropdown:hover .dropbtn {
  background-color: #fde402;
  color: #ed1010;
  text-decoration: none !important;
}

/* Add a grey background to dropdown links on hover */

.dropdown-content a:hover {
  background-color: #fde402;
  color: #ed1010;
  text-decoration: none !important;
}

/* Show the dropdown menu when the user moves the mouse over the dropdown button */

.dropdown:hover .dropdown-content {
  display: block;
}

/* The "responsive" class is added to the topnav with JavaScript when the user clicks on the icon. This class makes the topnav look good on small screens (display the links vertically instead of horizontally) */

@media screen and (max-width: 600px) {
  .topnav.responsive {
    position: relative;
  }
  .topnav.responsive a.icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {
    float: none;
  }
  .topnav.responsive .dropdown-content {
    position: relative;
  }
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}

/* Style the dropdown content (hidden by default) */

.dropdown-content {
  display: none;
  position: fixed;
  background-color: #FFFFFF;
  min-width: 120px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 99999999;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* scroll text style */

.scroll-left {
  height: 50px;
  width: auto;
  overflow: hidden;
  position: relative;
  background: #bd0d0d;
  color: #fcf903;
  font-size: 18px;
  font-weight: 500;
  border: none;
}

.scroll-left p {
  position: absolute;
  width: 130%;
  height: 100%;
  margin: 0;
  line-height: 50px;
  text-align: center;
  /* Starting position */
  transform: translateX(70%);
  /* Apply animation to this element */
  animation: scroll-left 30s linear infinite;
}

/* Move it (define the animation) */

@keyframes scroll-left {
  0% {
    transform: translateX(70%);
  }
  100% {
    transform: translateX(-80%);
  }
}

.Flash {
  float: right;
  background-color: #fcba03;
  border: none;
  color: #FFFFFF;
  cursor: pointer;
  display: inline-block;
  font-family: Arial;
  font-size: 16px;
  padding: 10px 15px;
  text-align: center;
  text-decoration: none;
  -webkit-animation: glowing 1500ms infinite;
  -moz-animation: glowing 1500ms infinite;
  -o-animation: glowing 1500ms infinite;
  animation: glowing 1500ms infinite;
  z-index: 99 !important;
}

@-webkit-keyframes glowing {
  0% {
    background-color: #fcba03;
    -webkit-box-shadow: 0 0 3px #B20000;
  }
  50% {
    background-color: #fcc11c;
    -webkit-box-shadow: 0 0 40px #FF0000;
  }
  100% {
    background-color: #B20000;
    -webkit-box-shadow: 0 0 3px #B20000;
  }
}

@-moz-keyframes glowing {
  0% {
    background-color: #fcba03;
    -moz-box-shadow: 0 0 3px #B20000;
  }
  50% {
    background-color: #fcc11c;
    -moz-box-shadow: 0 0 40px #FF0000;
  }
  100% {
    background-color: #B20000;
    -moz-box-shadow: 0 0 3px #B20000;
  }
}

@-o-keyframes glowing {
  0% {
    background-color: #fcba03;
    box-shadow: 0 0 3px #B20000;
  }
  50% {
    background-color: #fcc11c;
    box-shadow: 0 0 40px #FF0000;
  }
  100% {
    background-color: #B20000;
    box-shadow: 0 0 3px #B20000;
  }
}

@keyframes glowing {
  0% {
    background-color: #fcba03;
    box-shadow: 0 0 3px #B20000;
  }
  50% {
    background-color: #fcc11c;
    box-shadow: 0 0 40px #FF0000;
  }
  100% {
    background-color: #B20000;
    box-shadow: 0 0 3px #B20000;
  }
}


/* Style all font awesome icons */

.fa2 {
  padding: 15px !important;
  width: 50px !important;
  text-align: center !important;
  text-decoration: none !important;
  line-height: 25px;
}

.fa1 {
  padding: 15px !important;
  width: 30px !important;
  text-align: center !important;
  text-decoration: none !important;
  margin: 10px !important;
  line-height: 25px;
}


/* Add a hover effect if you want */

.fa:hover {
  opacity: 0.7 !important;
}


/* Set a specific color for each brand */


/* Facebook */

.fa-facebook {
  background: #3B5998 !important;
  color: white !important;
}


/* Twitter */

.fa-twitter {
  background: #55ACEE !important;
  color: white !important;
}


/* instagram */

.fa-instagram {
  background: #833AB4 !important;
  color: white !important;
}


/* instagram */

.fa-amazon {
  background: #FF9900 !important;
  color: white !important;
}

.support {
  padding: 15px !important;
  height: 55px !important;
  text-align: center !important;
  text-decoration: none !important;
  background-color: #bd0d0d !important;
  color: #fff !important;
  line-height: 25px;
}

.support:hover {
  opacity: 0.7;
}

.fundrise {
  padding: 15px !important;
  height: 55px !important;
  text-align: center !important;
  text-decoration: none !important;
  background-color: #FFC300 !important;
  color: #252e6e !important;
  line-height: 25px;
}

.fundrise:hover {
  opacity: 0.7;
}

.ebay {
  background-color: #FFF !important;
  padding: 15px !important;
  height: 55px !important;
  text-align: center !important;
  text-decoration: none !important;
  line-height: 25px;
}

.ebay:hover {
  opacity: 0.7;
}

.ebay2 {
  background-color: #FFF !important;
  padding: 15px !important;
  width: 300px !important;
  text-align: center !important;
  text-decoration: none !important;
  line-height: 25px;
}

.ebay2:hover {
  opacity: 0.7;
}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="viewport" content="width=device-width">
  <meta name="description" content="Portsmouth Lifeguards" />
  <link rel="shortcut icon" href="favicon.ico">
  <link rel="stylesheet" href="style.css">
  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" crossorigin="anonymous">
  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" crossorigin="anonymous"></script>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
  <title>Nav</title>
</head>
<body>
  <!-- ============================== THIS IS THE HEADER IT HAS THE LINKS, LOGO, SOCIAL MEDIA BUTTON, SCROLLBAR100 AND FLASHING DONATE BUTTON  ================================== -->
  <header>
    <div class="topnav" id="myTopnav">
      <a href="store.html">Store</a>
      <a href="donate.html">Support Us</a>
      <a href="gallery.html">Gallery</a>
      <a href="blogs.html">News</a>
      <a href="join-us.html">Join Us</a>
      <a href="contact.html">Contact</a>
      <a href="lifesaving.html">Lifesaving</a>
      <div class="dropdown">
        <button class="dropbtn" data-bs-toggle="dropdown">Equipment
        </button>
        <div class="dropdown-content">
          <a href="boat.html">Water Rescue Craft</a>
          <a href="vehicle.html">Rescue Vehicles</a>
          <a href="equipment.html">Lifeguard Equipment</a>
          <a href="hqstorge.html">HQ / Storge</a>
        </div>
      </div>
      <a href="about.html">About</a>
      <a href="index.html" class="active">Home</a><br>
    </div>
    </div>
    <img src="images/logo.png" class="p-2" class="img-responsive mt-auto" style="max-width:100%" alt="branded">
    <a href="https://www.facebook.com/portsearescue" target="_blank" class="fa fa2 fa-facebook" style="margin-left: 13%;"></a>
    <a href="https://twitter.com/portsearescue" target="_blank" class="fa fa2 fa-twitter"></a>
    <a href="https://www.instagram.com/portsearescue/" target="_blank" class="fa fa2 fa-instagram"></a>
    <a href="https://smile.amazon.co.uk/ch/265431-0" target="_blank" class="fa fa2 fa-amazon"></a>
    <a href="https://charity.ebay.co.uk/charity/i/Portsmouth-&-Southsea-Voluntary-Lifeguards/167080" target="_blank" class="ebay"><span style="color: #E53238;">e</span><span style="color :#0064D2;">b</span><span style="color: #F5AF02;">a</span><span style="color: #86B817;">y</span></a>
    <a href="https://www.paypal.com/uk/fundraiser/charity/3128890" target="_blank" class="support"> Donate to us &#10084; </a>
    <a href="https://www.justgiving.com/psvl" target="_blank" class="fundrise"> Fundrise for us &#10047; </a>
  </header><br>
  <div class="scroll-left">
    <p>As a voluntary lifeguard service, we rely solely on your kind donations to run and maintain our services.&nbsp;Any donation, big or small, is very much appreciated, and will help us to continue to save lives.</p>
  </div>
  <br><br>
  <a href="donate.html"><button class="Flash" style="position: fixed; bottom: 10px; right: 10px;">Support us &#10084;</button></a>
</body>
</html>