html {
    scroll-behavior: smooth;
}


body {
    width: 100vw;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}


h2 {
    text-align: center;
}

button {
    cursor: pointer;
}

hr {
    width: 90%;
    margin-left: auto;
    margin-right: auto;
}