body {
    margin : 0;
  }
  
  #toolbar {
    position: absolute;
    top: 0;
    left: 0;
    width: 48px;
  
    background-color: transparent;
    padding: 16px;
  
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 8px;
  }
  
  #render-window {
    width: 100%;
    height: 100%;
  }
  
  .color-button {
    border: none;
    width: 60px;
    height: 60px;
  }
  
  .color-button.selected {
    outline: 3px solid white;
  }