styles.css

#canvas-container {
  display: flex;
  justify-content: center;
}

#canvas-container canvas {
  border: 1px solid #000;
}

.control-panel {
  background-color: #f0f0f0;
  margin-top: 1rem;
  margin-left: 0.75rem;
  padding: 1rem;
}

.control-panel {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 1000;
  background-color: white;
  padding: 10px;
  border-radius: 5px;
  width: 300px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.link-container {
  text-align: center;
  margin-top: 20px;
}

#showReadme {
  font-size: 12px;
  cursor: pointer;
}

.popup {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.4);
}

.popup-content {
  position: relative;
  background-color: #fefefe;
  margin: 2% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
}

.close {
  color: #aaa;
  position: absolute;
  top: 0;
  right: 20px;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.btn-small {
  padding: .25rem .5rem !important;
  font-size: .875rem !important;
  line-height: 1.5 !important;
  border-radius: .2rem !important;
}