style.css

body {
  text-align: center;
  margin: 1px
}

header {
  position: fixed;
  background-color: rgb(210, 255, 229);
  border: double yellowgreen;
  top: 0;
  left: 0;
  right: 0;
}


#title {
  margin-top: 0px;
  margin-bottom: 0px;
}

#color-palette {
  line-height: 40px;
}

.color {
  display: inline-block;
  vertical-align: middle;
  border: 1px solid black;
  width: 30px;
  height: 30px;
  margin: 2px;
  transition: 0.2s;
}

#clear-board {
  font-size: 14px;
  margin: 5px auto 1px auto;
}

#custom-board {
  line-height: 0px;
  display: inline-flex;
}

#board-size {
  width: 50px;
  height: min-content;
  font-size: 15px;
  margin-top: 9px;
  margin-left: 5px;
}

#generate-board {
  font-size: 15px;
}

#pixel-board {
  /* ref: https://www.w3schools.com/css/css_grid.asp */
  display: inline-grid;
  border: 1px solid black;
  margin-top: 150px;
}

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