Liste mit Button öffnen lassen?

Wie kann ich diese Liste mit einem Button öffnen lassen? Also ohne das sich eine neue Seite öffnet.

Index:

<div id="showwrapper">
        <ul id="showlist">
            <li>
                <a target="_blank" href="https://domain.com">
                    <p>
                        Link #1
                        <br>
                         domain.com
                    </p>
                </a>
            </li>

            <li>
                <a target="_blank" href=https://domain.com22">
                    <p>
                        Link #2
                        <br>
                        domain.com2
                    </p>
                </a>
            </li>
            <li>
                <a target="_blank" href="https://domain.com3">
                    <p>
                        Link #3
                        <br>
                        domain.com3
                    </p>
                </a>
            </li>
            <li>
                <a target="_blank" href="https://domain.com4">
                    <p>
                        Link #4
                        <br>
                        domain.com4
                    </p>
                </a>
            </li>

        </ul>

    </div>

CSS

#showwrapper {
    position: fixed;
    top: 60%;
    left: 50%;
    width: 75vmin;
    margin-left: -32vmin;
    height: 57vh;
    margin-top: -28.5vh;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
    border-radius: 10px;
    z-index: 101;
}

showlist {

    list-style-type: none;
    margin: 0;
    padding: 2vmin;
}
Computer, Website, HTML, Webseite, programmieren, CSS, stylesheet, Index
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