第一个变量定义了全局 font-size 基准,第二个变量是 line-height 基准。我们使用这些变量和一些简单的公式计算出其它所有页面元素的 margin、 padding 和 line-height。自定义这些变量即可改变 Bootstrap 的默认样式。 内联文本元素 Marked text For highlighting a run of text due to its relevance in another ...
On the Styles menu, choose Add Style Rule. The Add Style Rule dialog box appears. Choose a type of CSS style selector: Select an Element (for example, choose the BODY element to define a default background, a font-family, or link colors for your page). Enter a Class name (this defi...
(Note that cascading doesn’t make sense for some properties and hence not all properties cascade. For example, cascading the height property doesn’t make sense as all children would have the same height as the parent, which is clearly impossible for a stack of more than one child.Appendix...
height:100px; border:3px solid #73AD21; } Try it Yourself » position: sticky; An element withposition: sticky;is positioned based on the user's scroll position. A sticky element toggles betweenrelativeandfixed, depending on the scroll position. It is positioned relative until a given offse...
Focus on Building the App October 2013 Volume 28 Number 10 ByRachel Appel| October 2013 Working with CSS leaves many developers frustrated because it’s full of nuances. Even minor changes to one selector or HTML element often propagate and affect another. Trying to keep CSS clean and effectiv...
Now let’s explore transitions, which let you change an element from one style or state to another. I’ll start with the hover pseudo class. Historically we’ve used CSS to set the states of an element, such as its initial state and its state after an event. Bu...
The way I think about:hasis this:it’s a parent selector pseudo-class. That is CSS-speak for “it lets you change the parent element if it has a child or another element that follows it.” This might feel weird! It might break your mental model of how CSS works. This is how I’...
To vertically center text within an element, you can also use the CSS line-height property. You’ll have to set the property with a value that is equal to the container element’s height. Here’s the CSS: Here’s the result:
height = 20; drawAnimation(canvas); I’m using the canvas as a bullet! So am I! As the canvas is changed over time with Javascript, we’ll all update our bullet image with it! anything else The function represents an invalid image. For example, all of the following element(...
One is obvious, and one is subtle. The obvious disadvantage is that we still have to hard-code a maximum height for the element, even if we don’t have to hard-code the height itself. Depending on your situation, maybe you can guarantee that you won’t need more height than that. Bu...