JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Titelgenerator</title>
    <link rel="stylesheet" href="css/main.css">

</head>

<body>
    <div id="greenscreen">

        <!--Bauchbinden-->
        <!--Breit-->

        <div id="bauchbinde-breit" class="bauchbinden deactivated" style="display: none">
            <div class="vertical-divider"></div>
            <div id="centering">
                <input type="text" id="speakers-breit">
                <input type="text" id="speakers-breit-under">
            </div>
        </div>

        <!--Schmal-->

        <div id="bauchbinde-schmal" class="bauchbinden">
            <input type="text" id="speakers-schmal">
        </div>

        <!--Logos-->
        <!--DB-->

        <div id="db-box">
        </div>

        <!--Campus-->

        <div id="campus-box">
        </div>

        <!--Splitscreenbar-->
        <div id="splitscreen" class="deactivated" style="display: none"></div>
    </div>
    <div id="hiddenUI">
        <a href="javascript:void(0);" class="hide" id="hide-db-logo"><img src="img/buttons/hidden.svg" alt=""></a>
        <a href="javascript:void(0);" class="hide" id="hide-campus-logo"><img src="img/buttons/hidden.svg" alt=""></a>
        <a href="javascript:void(0);" class="hide" id="hide-bauchbinde-schmal"><img src="img/buttons/hidden.svg" alt=""></a>
        <a href="javascript:void(0);" class="hide" id="hide-splitscreen"><img src="img/buttons/hidden.svg" alt=""></a>
        <a href="javascript:void(0);" class="hide" id="hide-bauchbinde-breit"><img src="img/buttons/hidden.svg" alt=""></a>
    </div>

    <script src="javascript/script.js"></script>
</body>

</html>

CSS

/*FONTS*/

@font-face {
    font-family: DBScreenHead-Black;
    src: url('../fonts/DBScreenHead-Black.woff2');
}

@font-face {
    font-family: DBScreenHead-Regular;
    src: url(../fonts/DBScreenHead-Regular.woff2);
}

/*GENERAL*/

body, html {
    margin: 0;
    padding: 0;
}

#greenscreen {
    position: relative;
    width: 1920px;
    height: 1080px;
    background: #00B140;
}

h1 {
    font-family: DBScreenHead-Black;
}

/*LOGOS*/

#db-logo {
    height: 75%;
    width: auto;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    /*Centering vertically*/
    left: 230px;
}

#campus-logo {
    height: 38%;
    width: auto;
    position: relative;
    top: 75px;
    left: 53%;
    transform: translate(-50%)/*Centering horizontally*/
}

#db-box {
    position: absolute;
    display: block;
    width: 500px;
    height: 120px;
    top: 120px;
    background: white;
    box-shadow: 0px -3px 12px 0px rgba(0, 0, 0, 0.5);
}

#campus-box {
    position: relative;
    display: block;
    width: 395px;
    height: 160px;
    left: 1350px;
    border-radius: 0px 0px 8px 8px;
    background: white;
    box-shadow: 0px -3px 12px 0px rgba(0, 0, 0, 0.5);
}

/*BAUCHBINDEN*/

.bauchbinden {
    margin: 0;
    padding: 0;
    background: white;
    position: absolute;
    box-shadow: 0px -3px 12px 0px rgba(0, 0, 0, 0.5);
}

#bauchbinde-schmal {
    width: 1920px;
    height: 160px;
    top: 920px;
}

#bauchbinde-breit {
    width: 1920px;
    height: 190px;
    top: 890px;
}

#speakers-schmal {
    position: relative;
    top: 50%;
    left: 360px;
    transform: translateY(-50%);
    /*Centering vertically*/
    width: auto;
    height: 100px;
    font-family: DBScreenHead-Black;
    font-size: 70px;
    color: #757575;
    background-color: transparent;
    border: none;
    border-left: 6px solid #757575;
    padding-left: 50px;
}

#speakers-breit {
    position: relative;
    left: 553px;
    width: auto;
    height: 118px;
    font-family:...

JavaScript

/*toggle view hiddenUI and hidden elements*/

function toggleHiddenElements() {
  let HiddenUI = document.getElementById("hiddenUI");
  let HiddenElements = document.getElementsByClassName("deactivated");
  if (HiddenUI.style.display == "none") {
    HiddenUI.style.display = "block";
    for (let i = 0; i < HiddenElements.length; i++) {
      HiddenElements[i].style.display = "block";
    }
  } else {
    HiddenUI.style.display = "none";
    for (let j = 0; j < HiddenElements.length; j++) {
      HiddenElements[j].style.display = "none";

    }
  }
}


/* EventListener for "Enter" Keybind */

document.addEventListener("keydown", (e) => {
  if (e.code == "Enter") {
    e.preventDefault();
    toggleHiddenElements();
  }
});

/*Toggle DB Logo in upper left corner*/

document.getElementById("hide-db-logo").onclick = function () {
  document.getElementById("db-box").classList.toggle("deactivated");
}

/*Toggle Campus Logo in upper right corner*/

document.getElementById("hide-campus-logo").onclick = function () {
  document.getElementById("campus-box").classList.toggle("deactivated");
}

/*Toggle Bauchbinde schmal*/

document.getElementById("hide-bauchbinde-schmal").onclick = function () {
  document.getElementById("bauchbinde-schmal").classList.toggle("deactivated");
}

/*Toggle Bauchbinde breit*/

document.getElementById("hide-bauchbinde-breit").onclick = function () {
  document.getElementById("bauchbinde-schmal").classList.toggle("deactivated");
}

/*Toggle Splitscreen*/

document.getElementById("hide-splitscreen").onclick = function () {
  document.getElementById("splitscreen").classList.toggle("deactivated");
};