material.css

.menu {
    background: none;
}

a:hover {
    text-decoration: none;
}

/** LINK **/

.menu ul.list li a {
    text-decoration: none;
}

.menu ul.list li a:hover, .menu ul.list li.chapter .simple:hover {
    background-color: #f8f9fa;
    text-decoration: none;
}

#book-search-input {
    margin-bottom: 0;
}

.menu ul.list li.divider {
    margin-top: 0;
    background: #e9ecef;
}

.menu .title:hover {
    background-color: #f8f9fa;
}

/** CARD **/

.card {
    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 3px 1px -2px rgba(0, 0, 0, 0.2), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
    border-radius: 0.125rem;
    border: 0;
    margin-top: 1px;
}

.card-header {
    background: none;
}

/** BUTTON **/

.btn {
    border-radius: 0.125rem;
}

/** NAV BAR **/

.nav {
    border: 0;
}
.nav-tabs > li > a {
    border: 0;
    border-bottom: 0.214rem solid transparent;
    color: rgba(0, 0, 0, 0.54);
    margin-right: 0;
}
.nav-tabs>li.active>a, .nav-tabs>li.active>a:focus, .nav-tabs>li.active>a:hover {
    color: rgba(0, 0, 0, 0.87);
    border-top: 0;
    border-left: 0;
    border-right: 0;
    border-bottom: 0.214rem solid transparent;
    border-color: #008cff;
    font-weight: bold;
}
.nav>li>a:focus, .nav>li>a:hover {
    background: none;
}

/** LIST **/

.list-group-item:first-child {
    border-top-left-radius: 0.125rem;
    border-top-right-radius: 0.125rem;
}
.list-group-item:last-child {
    border-bottom-left-radius: 0.125rem;
    border-bottom-right-radius: 0.125rem;
}

/** MISC **/

.modifier {
    border-radius: 0.125rem;
}

pre[class*="language-"] {
    border-radius: 0.125rem;
}

/** TABLE **/

.table-hover>tbody>tr:hover {
    background: rgba(0, 0, 0, 0.075);
}

table.params thead {
    background: none;
}
table.params thead td {
    color: rgba(0, 0, 0, 0.54);
    font-weight: bold;
}