index.css

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  font-family: sans-serif;
}

html,
body {
  height: 100%;
}

body {
  padding: 16px 32px;
}

body,
#container,
#upload-button {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

h1,
h3 {
  text-align: center;
}

#container {
  position: relative;
  width: 640px;
  height: 420px;
  max-width: 100%;
  max-height: 100%;
  border: 2px dashed #d1d5db;
  border-radius: 0.75rem;
  overflow: hidden;
  cursor: pointer;
  margin-top: 1rem;
  background-size: 100% 100%;
  background-position: center;
  background-repeat: no-repeat;
}

#mask-output {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#upload-button {
  gap: 0.4rem;
  font-size: 18px;
  cursor: pointer;
  opacity: 0.2;
}

#upload {
  display: none;
}

svg {
  pointer-events: none;
}

#example {
  font-size: 14px;
  text-decoration: underline;
  cursor: pointer;
  pointer-events: none;
}

#example:hover {
  color: #2563eb;
}

canvas {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0.6;
}

#status {
  min-height: 16px;
  margin: 8px 0;
}

.icon {
  height: 16px;
  width: 16px;
  position: absolute;
  transform: translate(-50%, -50%);
}

#controls > button {
  padding: 6px 12px;
  background-color: #3498db;
  color: white;
  border: 1px solid #2980b9;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}

#controls > button:disabled {
  background-color: #d1d5db;
  color: #6b7280;
  border: 1px solid #9ca3af;
  cursor: not-allowed;
}

#information {
  margin-top: 0.25rem;
  font-size: 15px;
}