* {
  margin: 0;
  padding: 0;
  box-sizing: content-box;
}

html {
  height: 100%;
}

body {
  height: 100%;
}

#grid {
  margin:auto;
  display: grid;
  width: 500px;
  height: 500px;
  grid-template-columns: '';
  grid-template-rows: '';
  background-color: white;
}

.gridItem {
  border: 1px solid silver;
}

input[type='color'] {
  width: 50px;
  height: 50px;
  border: none;
  background-color: transparent;
}

input[type='color']::-webkit-color-swatch {
  border: none;
  border-radius: 50px;
}