Divs, which act like glass sheets, can hold other HTML elements such as text objects. A CSS property named z-index determines the order in which divs appear when you stack one on top of another.

Use this handy, simplified guide to quickly learn HTML and CSS -- a foundation of modern web development.

Paste the following code into that box:p { line-height: 300%; }This CSS code tells Tumblr to set the line height of all your paragraphs to 300 percent. You can set this value to anything you like.