问我怎么才能让这个div转到左边而不是右边呢？

EN

    <style type="text/css">

#body {
    height: 100%;
    margin: 0;
    padding: 0;
}

#html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    background: #E0E0E0;
}

#header {
    background: #FFFFFF;
    height: 33px;
    width: 100%;
    padding: 5px 30px 5px 30px;
    font-family: arial;
    font-size: 30px;
    border-bottom: 1px #737373 solid;
    position: fixed;
    top: 0;
}

#container {
    width: 1205px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 50px;
}

#box {
    width: 228px;
    height: auto;
    background: #FFFFFF;
    border: 1px #5E5E5E solid;
    margin: 5px;
    float: left;
    font-family: arial;
}

#box_title {
    width: 218px;
    height: auto;
    padding: 5px;
    background: #5E5E5E;
    color: white;
    border-bottom: 1px #FFFFFF solid;
    float: left;
    font-family: arial;
}

#box_img {
    width: 210px;
    height: auto;
    float: left;
    margin-left: auto;
    margin-right: auto;
}

#box_options {
    width: 228px;
    height: 40px;
    background: #FFFFFF;
    color: #000000;
    border-top: 1px #5E5E5E solid;
    float: left;
    font-family: arial;