*::after,
*::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

canvas {
  border: 2px solid steelblue;
}

.toolbox {
  background-color: steelblue;
  border: 1px solid slateblue;
  display: flex;
  width: 396px;
  padding: 0.2rem;
}

.toolbox > * {
  background-color: white;
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  height: 30px;
  width: 30px;
  margin: 0.25rem;
  padding: 0.25rem;
  cursor: pointer;
}

.toolbox > *:last-child {
  margin-left: auto;
  cursor: pointer;
}