*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}

body{
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu {
    overflow: hidden;
    background-color: #333;
    position: fixed;
    top: 0;
    width: 100%;
}

.menu a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 25px 16px;
    text-decoration: none;
    transition: ease 0.3s;
}

.menu p{
    position: fixed;
    top: 25px;
    right: 100px;
    color: #f2f2f2;
}

.menu a:hover {
    background: #ddd;
    color: black;
}

.seite {
    width: 100%;
    height: 100%;
    padding: 80px 20px;
    transition: .4s ease;
}

.seite h1 {
    text-align: center;
}

.seite p {
    padding: 30px 0;
}


#dark_mode {
    position: fixed;
    top: 20px;
    right: 20px;
    appearance: none;
    -webkit-appearance : none;
    -moz-appearance : none;
    -o-appearance : none;
    width: 70px;
    height: 35px;
    background: black;
    border-radius: 22px;
    cursor: pointer;
    outline: none;
}

#dark_mode::before {
    content: '';
    position: absolute;
    width: 35px;
    height: 30px;
    background-color:white;
    border-radius: 35px;
    top: 2px;
    left: 2px;
    cursor: pointer;
    transition: .3s linear;
}

#dark_mode:checked + .seite {
    background-color: rgb(19, 18, 18);
    color: white;
}


#dark_mode:checked::before {
    left: 30px;
}

#dark_mode:checked {
    background: rgb(12, 177, 81);
}