@media only screen and (max-width: 40em) {

    /* INDEX */
    body {
        padding-top: 0;
    }

    .top-bar {
    height: 75px;
}

    #section_index footer {
        position: relative;
        bottom: auto;
    }

    #welcome {
        margin-top: 0;
    }

    #button_bar {
        position: relative;
        bottom: auto;
    }

    .box {
        width: auto;
    }

    /* product */
    .top_row {
        margin-top: 5px;
    }

    .button_back {
        margin-top: -14px;
    }
}