.preview-box {
    height: 220px;
    border: 2px dashed #ddd;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: #fafafa;
}

.preview-box img {
    max-height: 100%;
    max-width: 100%;
}