Untitled

<body>
    <header class="v-header container">
        <div class="fullscreen-backgorund-Booking">
                </div>
                <div>
                      <ul>
                                    <li><a href="Home">Home</a></li>
                                    <li><a href="McLaren Vale">McLaren Vale</a></li>
                          <li><a href="Barossa">Barossa</a></li>
                          <li><a href="Clare">Clare</a></li>
                          <li><a href="Online Booking">Online Booking</a></li>
                          <div id="mySidenav" class="sidenav">
                            <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
                            <a href="Home">Home</a>
                            <a href="McLaren Vale">McLaren</a>
                            <a href="Barossa">Barossa</a>
                            <a href="Clare">Clare</a>
                            <a href="Online Booking">Online Booking</a>
                          </div>
          <span id="sidebtn" onclick="openNav()">&#9776;</span>
      </ul>
</div>

<div class="header-overlay"></div>
<div class="header-content" style="width: 100%;"> <!-- width... is not working in external css... why?-->

    <h1 style="margin-top: -100px;">Online Booking</h1>
    <form name="myForm" action="/action_page.php" onsubmit="return validateForm()" method="post">
    <input type="text" name="fname" placeholder="Firstname">
    Date of Brith
    <input type="date" name="DoB" placeholder="Date of Birth">
    <input type="text" name="TelNumber" placeholder="Telephone number">
    <input type="email" name="email" placeholder="Email">
    Date of Tour
    <input type="date" name="DoT" placeholder="Date of tour (dd.mm.yyyy)">
    <form action="" id="calculate" onsubmit="return false;">

    <input type="text" placeholder="Number of Travellers" id="val" name="val" value="" />
        <label class="radiolabel">
        <input type="radio" name="button" value="100">McLaren</label>
        <label class="radiolabel">
        <input type="radio" name="button" value="150">Barossa</label>
        <label class="radiolabel">
        <input type="radio" name="button" value="90">Clare</label>
        <div id="result" style="display: block;">
          Result:</div>
    <input type="submit" id="submit" value="Submit" onclick="endresult(document.forms['myForm'].elements['button']);">
  </div>

    </form>
    </div>