body {
    background-color: #121212;
    color: #e0e0e0;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
}
nav {
    background-color: #1f1f1f;
    padding: 1em;
    text-align: center;
}
nav a {
    color: #90caf9;
    margin: 0 1em;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}
main {
    padding: 2em;
}
/* Zentrierter Form-Container für Login/Register-Seiten */
.form-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 2em;
}

.form-container form input, 
.form-container form select, 
.form-container form textarea {
    display: block;
    width: 100%;
    margin: 0 auto 1em auto;
    background: #1e1e1e;
    border: 1px solid #333;
    color: #e0e0e0;
    padding: 0.5em;
}

.form-container h2 {
    text-align: center;
}

.form-container .btn {
    display: block;
    margin: 0 auto;
}

form input, form select, form textarea {
    display: block;
    width: 100%;
    max-width: 400px;
    margin-bottom: 1em;
    background: #1e1e1e;
    border: 1px solid #333;
    color: #e0e0e0;
    padding: 0.5em;
}
form label {
    margin-top: 1em;
}
h2 {
    color: #bb86fc;
}
#messages li.success {
    color: #00e676;
}
#messages li.danger {
    color: #ff5252;
}