Edit in JSFiddle

<div class="box">
    <div class="list">
        <p class="p4">4</p>
        <p class="p1">1</p>
        <p class="p3">3</p>
        <p class="p2">2</p>
        <p class="p4">4</p>
        <p class="p1">1</p>
        <p class="p3">3</p>
        <p class="p2">2</p>
    </div>
    <div class="list">
        <p class="p2">2</p>
        <p class="p4">4</p>
        <p class="p3">3</p>
        <p class="p1">1</p>
        <p class="p2">2</p>
        <p class="p4">4</p>
        <p class="p3">3</p>
        <p class="p1">1</p>
    </div>
    <div class="list">
        <p class="p4">4</p>
        <p class="p1">1</p>
        <p class="p2">2</p>
        <p class="p3">3</p>
        <p class="p4">4</p>
        <p class="p1">1</p>
        <p class="p2">2</p>
        <p class="p3">3</p>
    </div>
</div>

html, body, p {
    margin:0;
    padding: 0;
}
.box {
    width: 340px;
    border: 1px #c2c2c2 solid;
    margin: 0 auto;
    overflow: hidden;
}
.box .list {
    float: left;
    width: 100px;
    margin: 10px 0 0 10px;
}
p {
    background-color: gray;
    margin-bottom: 10px;
}
.p1 {
    height: 100px;
}
.p2 {
    height: 125px;
}
.p3 {
    height: 150px;
}
.p4 {
    height: 200px;
}