MediaWiki:Common.css

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#hamburger-menu {
    display: none;
}

@media (max-width: 768px) {
    #hamburger-menu {
        display: inline-block;
    }
    .vector-main-menu {
        display: none;
        background-color: #007BFF; /* Customize background color */
        position: absolute;
        top: 40px; /* Adjust to fit your design */
        left: 0;
        width: 100%;
        padding: 10px 0;
        z-index: 100;
    }
    .vector-main-menu li {
        text-align: center;
        padding: 10px;
        border-top: 1px solid #fff;
    }
    .vector-main-menu li a {
        color: white; /* Menu link color */
        text-decoration: none;
        font-size: 18px;
    }
}