twitter bootstrap clearfix push down

Question

I'm using twitter bootstrap 3, to design a layout, which has two columns, a float sidebar and a main content with a left margin relative to the sidebar size, but when I use the clearfix class in an ul element inside the main content, seems that the clearfix class, clean the sidebar(float clear) and push the ul and subsequent content down.

see http://bootply.com/97603

HTML

<aside id="sidebar">
<h1>Search Items</h1>
<form id="searchForm">
    <div class="form-group">
        <label for="category">Category</label>
        <select name="category" id="category" class="form-control">
            <option value="">Choose</option>
            <option value="1">Category 1</option>
            <option value="2">Category 2</option>
            <option value="3">Category 3</option>
        </select>
    </div>
    <div class="form-group">
        <label for="term">Search Term</label>
        <input type="text" name="term" id="term" class="form-control"/>
    </div>
    <div class="text-center">
        <button class="btn btn-default">Search</button>
    </div>
</form>

CSS

body{
    background: #F7F5FA;
    overflow-x: hidden;
}
.container-full {
    margin: 0 auto;
    width: 100%;
    padding: 0 15px;
}
#sidebar{
    float: left;
    width: 260px;
    position: relative;
    background: #ddd;
    display: block
}
#sidebar #searchForm{
    padding: 10px;
}
#main-content{
    margin: 0px 0px 0px 260px;
    background: #FFF;
    position: relative;
    min-height: 600px;
    width: auto;
}
.gallery ul{
    background: black;
}
.gallery li{
    float: left;
    width: 120px;
    height: 120px;
    padding: 5px;
    background: #ddd;
}
.gallery li a{
    display: block;
}

How can i fix this behavior?

Answer 1

add this class to your CSS:

.row{
    overflow:hidden; 
}

DEMO

---

it is because of your aside, you set fixed width to aside and set margin to your main-content, this is not right way to put element side by side. but if you use percentage width to your aside and main-content and use float it will look good and there is no need for overflow:hidden (or auto).

look at this:

DEMO

#sidebar{
    float: left;
    width: 20%;   /*  instead 260px */
    position: relative;
    background: #ddd;
    display: block
}

#main-content{
    background: #FFF;
    position: relative;
    min-height: 600px;
    width: 80%;   /*  instead auto   */
    float:left;   /*  added          */
}