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.
Both slugs and snails are gastropods and belong to phylum Mollusca. Both have soft bodies with a muscular foot. Both slugs and snails are similar in many respects but with only a few differences. One of the noticeable differences is that snails have a shell on their backs whereas slugs do not have shells. The shell is coiled and about one to one and one-half inches long. Both slugs and snails have either a dark green, tan, light gray, or black body. Some of the varieties have patterns or spots on their bodies.