#cpb-preview img {
    border: 1px solid #ccc;
    padding: 2px;
    border-radius: 3px;
}
#cpb-preview {
    margin-top: 20px;
    border: 1px solid #ccc;
    padding: 10px;
    width: 400px; /* Canvas breedte */
    height: 400px; /* Canvas hoogte */
    position: relative;
    overflow: hidden;
}

.canvas-container {
    width: 100% !important;
    height: 100% !important;
}
.lower-canvas,
.upper-canvas {
    width: 100% !important;
    height: 100% !important;
}
.upper-canvas {
    border: 2px dashed #999;
}