.basic-fullscreen-page {
    position: relative;
    width: 100vw;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    width: 100vw;
    max-width: 100vw;
}

.basic-fullscreen-page,
.basic-fullscreen-page * {
    box-sizing: border-box;
}

.entry-content .basic-fullscreen-page:first-child {
    margin-top: 0;
}

.basic-fullscreen-page .page-content {
    max-width: 800px;
    width: 90%;
    text-align: center;
    padding: 40px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1;
}