Template:CategoryHeaderBox/styles.css

.category-header-box {
    margin: 0;
    padding: 0;
}

.category-header-table {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    background-color: #e8f4fa;
    border: none;
    margin: 0;
}

.category-header-title {
    font-size: 200%;
    padding: 20px;
    background-color: #4B9CD3;
    color: white;
    text-align: center;
}

.category-header-subtitle {
    font-size: 120%;
    padding: 10px;
    text-align: center;
}

/* Dark mode compatibility */
@media screen {
    html.skin-theme-clientpref-night .category-header-table,
    html.skin-theme-clientpref-night .category-header-box {
        background-color: #2a2d30;
    }

    html.skin-theme-clientpref-night .category-header-title {
        background-color: #1a73e8;
        color: #fff;
    }

    html.skin-theme-clientpref-night .category-header-subtitle {
        color: #ddd;
    }
}

@media (prefers-color-scheme: dark) {
    html.skin-theme-clientpref-os .category-header-table,
    html.skin-theme-clientpref-os .category-header-box {
        background-color: #2a2d30;
    }

    html.skin-theme-clientpref-os .category-header-title {
        background-color: #1a73e8;
        color: #fff;
    }

    html.skin-theme-clientpref-os .category-header-subtitle {
        color: #ddd;
    }
}