A birdcage (or bird cage) is a cage designed to house birds as pets. Antique (or antique-style) birdcages are often popular as collectors' items or as household decor but most are not suitable for housing live birds, being too small, or of unsafe materials or construction.ood quality cages designed for pet birds are more suitable. Most parrot cages are made or wrought iron and painted with a non-toxic paint referred to as powder-coating. However, the newest trend in the market is cages made of solid stainless steel.
A viewport is a 2D rectangle that defines the size of the rendering surface onto which a 3D scene is projected.
Setting the width and height to respond to the viewport size is trivial with the vh and vw units: This sets the height to be 80% of the viewport height, and the width to be 80% of the viewport width. The width of each column is set to be ideally 22rem (220px in this case) wide, but the browser can adjust this as needed.