body {
  background-color: deepskyblue;
  text-align: center;
}

header {
  margin: 0px auto 30px auto;
}

#reset {
  background-color: cadetblue;
  border: 10px inset cadetblue;
  border-style: groove;
  border-radius: 10px;
  display: inline-block;
  font-size: 30px;
  padding: 7.5px;
  margin: 30px auto;
}

#reset:hover {
  cursor: pointer;
  font-size: 32.5px;
}

main {
  background-color: black;
  border: 5px inset black;
  width: 576px;
  height: 576px;
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  grid-template-rows: repeat(16, 1fr);
  margin: auto auto 159.5px auto;
}

.square {
  cursor: crosshair;
  background-color: white;
  margin: 0.5px;
}

/* hidden & removed */
.hidden {
  visibility: hidden;
}

.removed {
  display: none;
}

/* jQuery */

.hover {
  background-color: black;
}