working css without space

HTML

<header>
        <img src="images/bicyclebanner.jpg" id="bikebanner" alt="People riding bikes." title="Biking">
        <h1 id="pagetitle"><a href="Lab04.html">Cycling Tours</a></h1>
        <nav>
            <ul>
                <li><a href="aboutUs.html">About Us</a></li>
                <li><a href="#askUs">Ask Us</a></li>
                <li><a href="#destinations">Destinations</a></li>
                <li><a href="#faq">FAQ</a></li>
                <li><a href="#reviews">Reviews</a></li>
                <li><a href="#seminars">Seminars</a></li>
                <li><a href="#tripPrep">Trip Prep</a></li>
            </ul>
        </nav>
    </header>

CSS

a{
text-decoration: none;
color: white;
padding-right: 5px;
padding-left: 5px;
padding-top: 0;
}

a:hover{
    color: black;
}
header{
    background-color: #C0C0C0;
    margin: 3px 60px 0;
}

li{
    display: inline;
    border-right: 1px solid black;
    border-left: 1px solid black;
    border-bottom: 1px solid black;
    border-top-left-radius: 0px;
    border-top-right-radius: 0px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
    margin: 0;
    padding: 0;
    border-spacing: 0;
}

nav{
  border: 1px solid blue;
  margin: 0;
    position: relative;
    text-align: center;
}

ul{
  margin: 0;
  padding: 0;
    list-style-type: none;
}

#bikebanner{
    position: relative;
    left: 65px;
}

h1 {
  margin: 0;
  padding: 0;
}
#pagetitle {
  border: 1px solid red;
}