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    Hi, in styles.css

    LINE 437
    .col-main {
    background: none repeat scroll 0 0 #FFFFFF;
    border-bottom: 1px solid #DBDBDB;
    border-left: 1px solid #DBDBDB;
    border-right: 1px solid #DBDBDB;
    float: left;
    margin-top: 1px;
    padding-left: 15px;
    width: 740px;
    LINE 1006
    .checkout-onepage-index .col-right {
    float: left;
    width: 240px;

    In custom.js

    DELETE LINES 30-31-32-33-34

    However, you can download the fixed theme from your dashboard.