html {font-size:62.5%;}
body {background-color:#222;box-sizing:border-box;color:#fff;font-family:'Vollkorn',serif;font-size:1.9rem;margin:0;padding:1rem;}

html, body {height:100%;}

main {display:flex;height:calc(100% - 6rem);max-height:calc(100% - 6rem);justify-content:center;align-items:center;}
main:before {background:transparent url('https://cards.scryfall.io/art_crop/front/1/e/1ee52480-8faf-4418-af70-fd999096e3bb.jpg?1562551811') top center no-repeat;background-size:cover;content:'';opacity:0.1;position:absolute;top:0;bottom:0;left:0;right:0;z-index:-1;}

form {padding-bottom:4rem;padding-right:25vw;}

input[type="number"] {margin-bottom:0.5rem;margin-right:0.75rem;width:6rem;}

h2 {margin:3rem 0 1rem;}
input[type="submit"] {height:2em;line-height:2em;margin:3rem 0 1rem;padding:0 1em;}

footer {font-family:sans-serif;font-size:1.5rem;text-align:center;position:fixed;bottom:1.5rem;width:100%;}
footer a {color:#fff;}