body {
  font-family: 'Inter', Arial, sans-serif;
  background: #f8f9fa;
  color: #222;
  margin: 0;
  padding: 0 0 32px 0;
}
.install-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #28a745;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: background 0.2s, box-shadow 0.2s;
  min-width: 44px;
  min-height: 44px;
  margin: 16px 0 0 0;
}
.install-btn:hover:not(:disabled) {
  background: #218838;
  box-shadow: 0 2px 6px rgba(40,167,69,0.08);
}
.install-btn:active {
  background: #1e7e34;
}
.install-btn:disabled {
  background: #6c757d;
  cursor: not-allowed;
  opacity: 0.7;
}