* {
  padding: 0;
  margin: 0;
  border: 0;
}

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

:focus,
:active {
  outline: none;
}

a:focus,
a:active {
  outline: none;
}

nav,
footer,
header,
aside {
  display: block;
}

html,
body {
  height: 100%;
  width: 100%;
  font-size: 100%;
  line-height: 1;
  font-size: 14px;
  -ms-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

input,
button,
textarea {
  font-family: inherit;
}

input::-ms-clear {
  display: none;
}

button {
  cursor: pointer;
}

button::-moz-focus-inner {
  padding: 0;
  border: 0;
}

a,
a:visited {
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

ul li {
  list-style: none;
}

img {
  vertical-align: top;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: 400;
}

body .wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  background-image: url(../img/elia-pellegrini-Ytb42qw9iQ0-unsplash.jpg);
}

body .wrapper .box {
  display: flex;
  border: 5px solid black;
  width: 80vmin;
  height: 80vmin;
  justify-content: center;
  align-items: center;
  background-color: #b8b3b3;
}

body .wrapper .box .board {
  border-spacing: 0;
  border-collapse: collapse;
}

body .wrapper .box .board td {
  border: 0.5vmin solid black;
}

body .wrapper .box .board th {
  padding: 3.1vmin;
}

body .wrapper .box .board .white {
  background: white;
}

body .wrapper .box .board .black {
  background: black;
}