gistfile1.scss

html,
body,
ul,
li {
    margin: 0; padding: 0;
}

body {
    font: normal 16px/24px "Helvetica Neue", Helvetica, Arial, freesans, sans-serif; background: #c1c1c1;
}

div,
ul,
li {
    background: rgba(86,61,124,.15); border: 1px solid rgba(86,61,124,.2); padding: 5px;
}

#product-list {
    width: 860px; margin: 20px auto; overflow: hidden;
}

#body {
    width: 860px; margin: 20px auto; background: #ccc; overflow: hidden;
}
.error {
    background: #f00; color: #fff; padding: 10px; margin: 0 0 20px 0;
}
.button {
    background: #008CBA; color: #fff; display: inline-block; padding: 10px; cursor: pointer;
    &:hover {
        background: #007095;
    }
    &.active {
        background: #4DAECF;
    }
}
.cart-summary {
    background: #fff; margin: 0 0 10px 0; padding: 10px;
}
#product-list {
    aside,
    main {
        background: #fff; min-height: 100px; overflow: hidden;
    }
    aside {
        width: 200px; float: left;
        .categories {
            overflow: hidden;
            li {
                display: block; margin: 5px;
            }
        }
    }
    main {
        width: 640px;
        float: right;
        overflow: hidden;
    }
}
#checkout-summary {
    padding: 10px; background: #fff;
}