html {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: linear-gradient(to bottom right, #f9fafb, #f3f4f6);
}

#oberlin-filter-paper-selection-tool {
  width: 100%;
  height: 100%;
}

#oberlin-filter-paper-selection-tool:empty {
  position: relative;
  min-height: 200px;
}

#oberlin-filter-paper-selection-tool:empty::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: 3px solid #e5e7eb;
  border-top-color: #1B4B7D;
  border-radius: 50%;
  animation: oberlin-spin 0.8s linear infinite;
}

@keyframes oberlin-spin {
  to { transform: rotate(360deg); }
}