body {
     margin: 0;
     /* Set the margin of the entire page to 0 */
 }

 .pdf-container {
     width: 100%;
     margin: 0 auto;
     height: 100vh;
     /* 100% of the viewport height */
     overflow: hidden;
 }

 .iframe-book {
     width: 100%;
     height: 100%;
     border: none;
 }