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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
body {
    font-family: "Lucida Sans", Verdana, sans-serif;
}


.main img {
    width: 100%;
}


h1{
    font-size: 1.625em;
}


h2{
    font-size: 1.375em;
}


.header {
    padding: 1.0121457489878542510121457489879%;
    background-color: #f1f1f1;
    border: 1px solid #e9e9e9;
}


.menuitem {
    margin: 4.310344827586206896551724137931%;
    margin-left: 0;
    margin-top: 0;
    padding: 4.310344827586206896551724137931%;
    border-bottom: 1px solid #e9e9e9;
    cursor: pointer;
}


.main {
    padding: 2.0661157024793388429752066115702%;
}


.right {
    padding: 4.310344827586206896551724137931%;
    background-color: #CDF0F6;
}


.footer {
    padding: 1.0121457489878542510121457489879%;
    text-align: center;
    background-color: #f1f1f1;
    border: 1px solid #e9e9e9;
    font-size: 0.625em;
}


.gridcontainer {
        width: 100%;
}


.gridwrapper {
        overflow: hidden;
}


.gridbox {
    margin-bottom: 2.0242914979757085020242914979757%;
    margin-right: 2.0242914979757085020242914979757%;
    float: left;
}


.gridheader {
    width: 100%;
}


.gridmenu {
    width: 23.481781376518218623481781376518%;
}


.gridmain {
    width: 48.987854251012145748987854251012%;
}


.gridright {
    width: 23.481781376518218623481781376518%;
    margin-right: 0;
}


.gridfooter {
    width: 100%;
    margin-bottom: 0;
}


@media only screen and (max-width: 500px) {
    .gridmenu {
        width: 100%;
    }


    .menuitem {
        margin: 1.0121457489878542510121457489879%;
        padding: 1.0121457489878542510121457489879%;
    }


    .gridmain {
        width: 100%;
    }


    .main {
        padding: 1.0121457489878542510121457489879%;
    }


    .gridright {
        width: 100%;
    }


    .right {
        padding: 1.0121457489878542510121457489879%;
    }


    .gridbox {
        margin-right: 0;
        float: left;
    }

}

</style>
</head>
<body>
<div class="gridcontainer">
    <div class="gridwrapper">
        <div class="gridbox gridheader">
            <div class="header">
                <h1>The Pulpit Rock</h1>
            </div>
        </div>
        <div class="gridbox gridmenu">
            <div class="menuitem">The Drive</div>
            <div class="menuitem">The Walk</div>
            <div class="menuitem">The Return</div>
            <div class="menuitem">The End</div>
        </div>
        <div class="gridbox gridmain">
            <div class="main">
<h1>The Walk</h1>
<p>The walk to the Pulpit Rock will take you approximately two hours, give or take an hour depending on the weather conditions and your physical shape.</p>
<img src="pulpitrock.jpg" alt="Pulpit rock" width="" height="">

            </div>
        </div>
        <div class="gridbox gridright">
            <div class="right">
<h2>What?</h2>
<p>The Pulpit Rock is a part of a mountain that looks like a pulpit.</p>
<h2>Where?</h2>
<p>The Pulpit Rock is in Norway</p>
<h2>Price?</h2>
<p>The walk is free!</p>
            </div>
        </div>
        <div class="gridbox gridfooter">
            <div class="footer">
<p>This web page is a part of a demonstration of fluid web design made by www.w3schools.com. Resize the browser window to see the content response to the resizing.</p>
            </div>
        </div>
    </div>
</div>
</body>
</html>



Result:
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