.workspace-70 {
    height: 50vh; /* 70% of viewport height */
    background-color: #f8f9fa; /* light gray so you can see it */
    width: 100%;
    margin-top: 1rem; /* small spacing below header */
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px dashed #dee2e6; /* optional, just to see boundaries */
}