html {
    overflow-y: scroll;
    font-size: 62.5%; 
}
html, body {
    margin: 0;
    padding: 0;
}
h1, h2, h3, h4 {
    margin: 0;
    padding: 0;
}
ul, li {
    margin: 0;
    padding: 0;
    list-style-type: none;
}