.pdfContainer {
    width: 100%;
    height: 100vh; /* ili koliko god da želiš visinu prostora */
    padding-top: 10px;
    padding-bottom: 10px;
    box-sizing: border-box;
}

.pdfEmbed {
    width: 100%;
    height: calc(100% - 20px); /* 100% visine roditelja - 10px gore i 10px dole */
    border: none;
    display: block;
}