Centering a block or image. Sometimes it is not the text that needs to be centered, but the block as a whole. Or, phrased differently: we want the left and right margin to be equal. The way to do that is to set the margins to 'auto'.In case of a browser, that means the browser window). So centering an element in the viewport is very simple. Here is a complete example. (This example uses HTML5 syntax.). You can see the result in a separate document. The 'margin-right: -50%' is needed to compensate the 'left: 50%'.
Slugs and snails share many similar features. However, the most apparent difference between the two is that snails carry coiled shells on their backs whereas slugs do not contain these shells. A shell of snail is composed of calcium carbonate and it keeps growing with the growth of snail.Both produce mucous for retaining the moisture.owever, the most apparent difference between the two is that snails carry coiled shells on their backs whereas slugs do not contain these shells. A shell of snail is composed of calcium carbonate and it keeps growing with the growth of snail. Both produce mucous for retaining the moisture.
Snails. The main difference between slugs and snails is the equipment the snail comes with; his shell, which grows along with his body. Most snails are gray, but the shells can range from white to brown or almost black, and be mottled or striped.lugs and snails are mollusks, the same family of creatures claiming oysters, octopus, squid and clams. There are more than 60,000 species of snails and slugs. The varieties living in the sea begin life as larvae floating about in plankton. Land and freshwater slugs and snails typically hatch from eggs.