web-ui/src/App.css

.app-container {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-title, .app-subtitle {
  margin-left: 24px;
  margin-bottom: 0;
}

.app-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: space-around;
}

.app-stage-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.app-stage-section.top {
  flex: 2;
}

.app-stage-section.bottom {
  flex: 1;
  background: var(--bg-secondary);
}