How to change transparency in css

CSS is a language used for web design and layout. It can change the size, color, position, border and other attributes of elements. And one of the common needs is to change the transparency of an element.

There are two common ways to change transparency: one is to use rgba color value, the fourth parameter represents transparency, the value range is 0 to 1; the other is to use the opacity attribute, the value range is also is 0 to 1. Next, these two methods and their usage scenarios will be introduced in detail.

1. Use rgba color values

Using rgba color values can directly change the transparency of elements without affecting other styles, such as borders and shadows. This method is suitable for scenarios where other styles do not need to be changed.

Code example:

.element { background-color: rgba(255, 0, 0, 0.5); /* 红色半透明 */ border: 1px solid #000; box-shadow: 2px 2px #ccc; }

Effect display:

##Use opacity attribute

.parent { opacity: 0.5; } .child { background-color: #fff; border: 1px solid #000; box-shadow: 2px 2px #ccc; }

3. The above two Both methods can change the transparency of elements, but they will have different effects in different scenarios. Generally speaking, if you only need to change the background color transparency of an element, it is recommended to use rgba color values, which can maintain the opacity of the border and shadow. If you need to change the transparency of an element and its content at the same time, you can use the opacity attribute.

For example, when designing a card, it is often necessary to make the card have a certain degree of transparency, so that it will look more beautiful. At this time, you can use the opacity attribute, as shown below:

.card { background-color: #fff; border-radius: 10px; box-shadow: 2px 2px 10px #ccc; opacity: 0.8; }

Effect display:

##Summary

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