JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Bebas+Neue&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="style.css">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login PAGE</title>

</head>

<body>


    <div id="wrapper">
        <header>
            <h1>LOREM IPSUM WORKSTATION V.1</h1>
        </header>

        <div id="mehrspaltig">
            <nav>NAV</nav>
            <article>
                <div id="flex">
                    <img id="logo" src="https://i.ibb.co/3SZ1R5h/loremipsum.png" alt="Logo">

                    <div class="login_formular">
                        Zur Anmeldung

                        <input type="text" placeholder="Username" id="username">

                        <input type="password" placeholder="Password" id="password">

                        <button id="button"> <a href="#">Log IN</a></button>
                    </div>
                </div>
            </article>
            <aside>ASIDE</aside>

        </div>



        <footer>FOOTER</footer>
    </div>


</body>

</html>

CSS

html,
body {
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
}

a {
  text-decoration: none;
  color: rgb(0, 0, 0);

}


#wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 100%;
}

header {

  overflow: hidden;
  max-height: 0;
  font-family: 'Bebas Neue', cursive;
  font-size: 30px;
  padding-bottom: 35px;
  margin: auto;

}

#mehrspaltig {
  flex: 1;
  display: flex;
  flex-direction: row;
  background-color: silver;
}

#flex {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  width: 50%;
  align-items: center;
  justify-content: center;
  margin: auto;
}

#logo {

  margin: auto;
  min-height: 250px;
  max-height: 250px;
  max-width: 250px;
  min-width: 250px;





}

.login_formular {

  margin: auto;
  padding: 16px;
  border-radius: 5px;
  min-height: 150px;
  max-height: 150px;
  min-width: 250px;
  max-width: 250px;

  text-align: center;
  display: flex;
  flex-direction: column;

  background-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0px 0px 20px 5px #ff6565;
}

input {
  margin-top: 5px;
  background: transparent;
  padding: 2px 0 2px 50px;
  outline: none;
  border-radius: 5px;
  border: solid 1px;

}

input:hover,
input:focus {
  box-shadow: 0px 0px 20px 5px #ff6565;
}


#button {
  min-width: 75px;
  border: solid 1px;
  border-radius: 5px;
  cursor: pointer;
  text-decoration: none;
  border: transparent;
  margin: auto;
  justify-content: center;
  display: block;
  margin-top: 15px;

  background-color: rgb(255, 205, 113);
  font-family: 'Bebas Neue';
}

#button:hover {
  transform: scale(1.05);
  box-shadow: 0px 0px 20px 5px #ff6565;

}

nav {
  flex: 1;
  background-color: darkgray;
}

article {
  flex: 5;
  background-color: orange;
}

aside {
  flex: 1;
  background-color: gray;
}

footer {
  background-color: limegreen;
}