#spice_book .spice_pane_left {
    width: 40%;
    display: inline-block;
}

#spice_book .spice_pane_right {
    width: 50%;
    display: inline-block;
    vertical-align: top;
    border-left: 1px solid rgba(0,0,0,0.1);
    padding-left: 10px;
}

#spice_book .book_data_item {
    display: inline-block;
    padding-right: 6px;
    color: gray;
}

#spice_book #critic-link {
    float: right;
}

#spice_book #book-rating-visual {
    display: inline;
    width: 21px;
    vertical-align: -12%;
}


#spice_book .spice_pane_left {
    width: 40%;
    display: inline-block;
}

#spice_book .spice_pane_right {
    width: 50%;
    display: inline-block;
    vertical-align: top;
    border-left: 1px solid rgba(0,0,0,0.1);
    padding-left: 10px;
}

#spice_book .book_data_item {
    display: inline-block;
    padding-right: 6px;
    color: gray;
}

#spice_book #critic-link {
    float: right;
}

#spice_book #book-rating-visual {
    display: inline;
    width: 21px;
    vertical-align: -12%;
}

@media (max-width: 320px) {
    #spice_book .spice_pane_right {
	padding-left: 0px;
	border-left: 0px none;
	width: 100%;
	display: block;
    }

    #spice_book .spice_pane_left {
	width: 100%;
	display: block;
    }
}
Add media queries in the CSS.
Book: Add media queries in the CSS.

Add @media to change the layout when the screen size is <= 320px. The current layout looks too squished.
