Bản mẫu:BKTT:Quyển/styles.css

.group-layout {
    display: flex;
    flex-wrap: wrap;
}

.group-layout .group {
    flex: 0 0 calc(50% - 10px);
}

.group-layout .group .section {
    box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid #E0E0E0;
    border-radius: 3px;
    padding: 20px;
}

.group-layout .group .section-title {
    font-size: 24px;
    font-weight: bold;
    padding: 20px 0;
}

.group-layout .group:nth-child(odd) {
    margin-right: 20px;
}

@media only screen and (max-width: 1100px) {

    .group-layout .group {
        flex: 0 0 100%;
    }

}

#collapse .mw-collapsible-toggle .up,
#collapse.mw-collapsed .mw-collapsible-toggle .down {
 display: none;
}
#collapse .mw-collapsible-toggle .down,
#collapse.mw-collapsed .mw-collapsible-toggle .up {
 display: block;
}

#collapse:focus { outline:none; }