body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.iframe-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

iframe {
    position: absolute;
    top: -100px; /* Adjust this value to hide the header */
    left: 0;
    width: 100%;
    height: calc(100% + 100px); /* Adjust this value to match the top value */
    border: none;
}