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

html {
    box-sizing: border-box;
    scroll-behavior: smooth;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    height: 100vh;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    align-content: center;
}

ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

li {
    padding: 10px;
}

button {
    width: 150px;
}

footer {
    margin-top: 50px;
}