gistfile1.html

<div id="main" class="container">
    <div id="header" class="navbar">
        <div class="navbar-inner">
            <a class="brand" href="#">numerosus</a>
            <form class="navbar-search pull-center">
                <input type="text" class="search-query" placeholder="Rechercher">
            </form>
            <ul id="menu" class="nav pull-right">
                <li><a href="#">info</a></li>
                <li><a href="#">identifiez-vous</a></li>
            </ul>
        </div>
    </div>
</div>

gistfile2.css

@green: #C3CD37;
@grey: #A9A9A9;

* {
    outline: none;
    -webkit-tap-highlight-color: rgba(255, 255, 255, 0); 
}

#main {
    width: 100%;
}

#header .navbar-inner {
    padding-left: 15px;
    padding-right: 15px;
    background: @green;
    border: none;
    font-size: 12px;

    .borderRadius(0px);

    .brand {
        text-shadow: none;
        font-size: 18px;
    }

    a,
    a:visited,
    a:hover,
    a:active {
        color: white;
        text-shadow: none;
    }

    #menu {
        a,
        a:visited,
        a:hover,
        a:active {
            color: white;
            text-shadow: none;
            padding-left: 7px;
            padding-right: 7px;
            text-transform: uppercase;
        }
    }

    form {
        margin-top: 7px;
        float: none;
        margin-left: auto;
        margin-right: auto;

        .search-query {
            height: 16px;
        }
    }
}