html, body {
    height: 100%;
}
body {
    background-color: #f5f5f5;
.full-height {
    height: 90vh;
    display: flex;
    flex-direction: column;
}

.full-height iframe {
    flex: 1 1 auto;
    border: none;
}

.container  { 
    background-color: blue;
    max-width: 1000px;
}
.container {
    margin: 40px auto;
    max-width: 1000px;
    padding: 24px;
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    border-radius: 8px;