Edit in JSFiddle

$('#content').resizable();

<div id="content">
    <div id="float">
        <h4>Floating blocks:</h4>
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
    </div>
</div>

#float > div {
    background: #FFAAFF;
    border: 1px dotted gray;
    float: right;
    font-size: 32px;
    height: 78px;
    line-height: 78px;
    text-align: center;
    width: 78px;
    vertical-align: middle;
}

#float:after {
    clear: both;
    content: ".";
    display: block;
    height: 0;
    visibility: hidden;
}

#float {
    display: block;
    width: 100%;
}
#float h4{
    font-size: 14px;
    margin-top: 0;
}

#float {
    background: #CCFFCC;
}

#content {
    border: 1px dotted gray;
    display: inline-block;
    font-size: 0;
    height: auto;
    max-width: 400px;
    width: 100%;
}