* {
  margin: 0;
  padding: 0;
}

body {
  background-image: url('https://mir-s3-cdn-cf.behance.net/project_modules/max_1200/f3638265290819.5d61d475ee01c.jpg');
  background-repeat: no-repeat;
  background-size: cover;
  height: 910px;
}

h1 {
  margin: 25px 0;
  font-size: 48px;
  font-family: Courier New, Courier, monospace;
  text-align: center;
}

table {
  border: 2px solid black;
  border-spacing: 1px;
  background-color: #ccc;
}

header table {
  margin: auto;
  margin-bottom: 15px;
}

section {
  text-align: center;
}

#board-size , #generate-board {
  display: inline-block;
}

#clear-board {
  display: block;
  margin: 15px auto;
}

#board-size {
  margin-bottom: 15px;
  width: 35px;
}

#pixel-board {
  display: table;
  margin: 25px auto;
}

.color {
  border: 1px solid black;
  width: 40px;
  height: 40px;
}

.pixel {
  background-color: white;
  border: 1px solid black;
  width: 40px;
  height: 40px;
}