body {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-background-color);
}

#start_menu {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    min-width: 80%;
}