*{
    box-sizing: border-box;
    margin: 0px;
    padding: 0px;
}
html{
    scroll-behavior: smooth;
}
body{
    scroll-behavior: smooth;
    scrollbar-width: none;
}
#up{
    position: fixed;
    width: 50px;
    height: 50px;
    right: 20px;
    bottom: 20px;
    cursor: pointer;
}