* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
}

iframe {
    width: 100%;
    height: 0;
    border: none;
    position: absolute;
    left: 0;
    top: 0;
}