html {
    overflow-y: scroll;
}


body {
    margin: 0;
}

.nav-menu {
    display: flex;
    flex-wrap: wrap;
    width: 66%;
    max-width: 100%;  /* neu */
    justify-content: space-around;
    row-gap: 1em;
    column-gap: 2em;
    margin-top: 100px;
    margin-bottom: 2em;
}

.nav-button {
    height: 2em;
    width: 8em;
    color: white;
    background-color: blue;
    border-color: black;
    font-size: 3em;
    border-radius: 30px;
    flex-shrink: 0;  /* neu: verhindert Zusammenschrumpfen */
}

.nav-spacer {
    flex-basis: 100%;  /* springt in nächste Reihe */
    height: 2em;       /* Höhe der „Leerzeile“ */
}


#button-2048 {
    background-image: url('/GlobalResources/buttonPictures/2048.png');
    background-size: cover;     
    background-position: center;
    background-repeat: no-repeat;
    color: white;               
    border: none;
    text-shadow: 
    -1px -1px 0 black,
     1px -1px 0 black,
    -1px  1px 0 black,
     1px  1px 0 black;          
  }
  
#button-dvd{
    background-image: url('/GlobalResources/buttonPictures/dvd.png');
    background-size: cover;     
    background-position: center;
    background-repeat: no-repeat;
    color: white;               
    border: none;
    text-shadow: 
    -1px -1px 0 black,
     1px -1px 0 black,
    -1px  1px 0 black,
     1px  1px 0 black;
}

#button-pong{
    background-image: url('/GlobalResources/buttonPictures/pong.png');
    background-size: cover;     
    background-position: center;
    background-repeat: no-repeat;
    color: white;               
    border: none;
    text-shadow: 
    -1px -1px 0 black,
     1px -1px 0 black,
    -1px  1px 0 black,
     1px  1px 0 black;
}

#button-memory-game{
    background-image: url('/GlobalResources/buttonPictures/memory-game.png');
    background-size: cover;     
    background-position: center;
    background-repeat: no-repeat;
    color: white;               
    border: none;
    text-shadow: 
    -1px -1px 0 black,
     1px -1px 0 black,
    -1px  1px 0 black,
     1px  1px 0 black;
}