.main-content {
    margin-top: 100px; /* same as header height */
    min-height: calc(100vh - 220px); /* still accounting for header + footer */
    overflow-y: auto;
    padding: 40px 40px 80px 40px;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: #fff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    box-sizing: border-box;
}