pressbooks aldine theme the theme used for the front page or default book
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.book{height:16.25rem;width:calc(100% / 3 - 1rem);margin:0 1rem 1rem 0}}@media screen and (min-width:60rem){.catalog #content{width:calc(100% - 1rem);margin-left:auto;margin-right:auto;max-width:103.125rem;background:transparent}.filter-sort{width:calc(25% - 2rem);height:auto;float:left;margin:2rem 1rem 1rem}fieldset{width:100%;display:block;margin-bottom:0}fieldset div:not([hidden]){position:relative;border:0}.clear-filters{width:100%;margin-left:0}.catalog .books{width:75%;float:right;margin-left:0}.catalog .book{height:16.25rem;max-width:calc(100% / 3 - 1rem);margin:0 1rem 1rem 0}.catalog-navigation{width:75%;float:right;padding-right:1rem}}.mu_register.wp-signup-container{margin:7.5rem auto 0;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column}.mu_register.wp-signup-container *{text-align:left}.mu_register.wp-signup-container h2{text-align:center;-webkit-box-ordinal-group:0;-ms-flex-order:-1;order:-1}.mu_register.wp-signup-container .mu_alert{margin-bottom:2rem}.mu_register.wp-signup-container form{margin-top:0}.mu_register.wp-signup-container input:not([type=submit]){padding:0}.mu_register.wp-signup-container .checkbox{margin-right:1em}.mu_register.wp-signup-container .submit{text-align:center}.mu_register.wp-signup-container [type=submit]{width:auto;margin:0 auto;text-align:center}