webview/public/pdf/style/viewer.css

.pdf-container {
  margin: 1em auto;
  overflow-x: hidden;
  overflow-y: auto;
}

.pdf-page {
  position: relative;
  margin: auto;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.1), 0 6px 20px 0 rgba(0, 0, 0, 0.09);
  /* display: flex; */
}

.pdf-page canvas {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
}

.pdf-page.placeholder {
  display: flex;
  margin-bottom: 0em !important;
  margin-top: 0em !important;
  height: 100%;
  width: 100%;
}

.pdf-page .content-wrapper {
  margin: 0 !important;
  padding: 0 !important;
  display: flex !important;
}

.pdf-page .content-wrapper .loader {
  border: 2px solid #f3f3f3;
  border-top: 3px solid #3498db;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  margin: auto;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}