.o-well {
    box-sizing: border-box;

    // 8 columns plus gutters
    max-width: unit( @well-max / @base-font-size-px, em );
    padding:
        unit( @grid_gutter-width / @base-font-size-px, em )
        unit( ( @grid_gutter-width / 2 ) / @base-font-size-px, em );
    border: 1px solid @well-border;
    background-color: @well-bg;

    .respond-to-min( @bp-sm-min, {
        padding-left: unit( @grid_gutter-width / @base-font-size-px, em );
        padding-right: unit( @grid_gutter-width / @base-font-size-px, em );
    } );
}