:root {
    --clr-neon: hsl(317 100% 54%);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}


*{
    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%;
    height: 5rem;
    background-image: url(./bilder/bg2.jpg);
    place-items: center;
    padding-right: 10rem;
}

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

.neon-button {
    font-size: 1rem;
    display: inline-block;
    cursor: pointer;
    text-decoration: none;
    color: var(--clr-neon);
    border: var(--clr-neon) 0.125em solid;
    padding: 0.125em 0.5em;
    margin-left: 0.85em;
    border-radius: 0.25em;
    text-shadow: 0 0 0.125em hsl(0 0% 100% / 0.3), 0 0 0.45em currentColor;
    box-shadow: inset 0 0 0.5em 0 var(--clr-neon), 0 0 0.5em 0 var(--clr-neon);
    position: relative;
}

.neon-button::before {
    pointer-events: none;
    content: "";
    position: absolute;
    background: var(--clr-neon);
    top: 120%;
    left: 0;
    width: 100%;
    height: 100%;
  
    transform: perspective(1em) rotateX(40deg) scale(1, 0.35);
    filter: blur(1em);
    opacity: 0.7;

}

.neon-button::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    box-shadow: 0 0 2em 0.5em var(--clr-neon);
    opacity: 0;
    background-color: var(--clr-neon);
    z-index: -1;
    transition: opacity 100ms linear;
}

.neon-button:hover,
.neon-button:focus {
  color: var(--clr-bg);
  text-shadow: none;
}

.neon-button:hover::before,
.neon-button:focus::before {
  opacity: 1;
}
.neon-button:hover::after,
.neon-button:focus::after {
  opacity: 1;
}

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

a .menu .spaceholder {
    size: 0.125em;
}

.seite {
    width: 100%;
    height: 100%;
    padding: 80px 20px;
    transition: .4s ease;
    background-image: url(./bilder/background.png);
    background-size: 100%;
}

.seite h1 {
    text-align: center;
}

.seite p {
    padding: 30px 0;
}

.signIn {
    position: fixed;
    top: 20px;
    right: 20px;
    appearance: none;
    -webkit-appearance : none;
    -moz-appearance : none;
    -o-appearance : none;
    width: 70px;
    height: 35px;
    background-image: url(./bilder/SignIn_Button.jpg);
    border-radius: 22px;
    cursor: pointer;
    outline: none;
}

#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: #1e1e1e;
    color: white;
}


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

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