<p> Sometimes you want to change the style of a web page element, but it is always overwritten by other CSS rules. At this time, you may think of using !important to force coverage. While it is not a best practice, it does solve the problem in some cases.
What is !important ?
<p> In CSS, !important is a keyword that can be added after a style attribute value to increase the priority of that style. It bypasses the normal casing order and makes this style "effective as much as possible".
<p> for example: p {
color: red !important;
}<p> After writing this way, the text color of all <p> tags will turn red unless there is another rule that uses the !important and has a higher priority. 
When should I use !important ?
<p> It is generally recommended not to use it or use it less, as abuse will lead to maintenance difficulties. But it can come in handy in the following situations:- Third-party library style overlay : When you use a UI framework (such as Bootstrap or Ant Design), but want to quickly modify the style of a component.
- Browser plug-in or user script : For example, if you are writing a Greasemonkey script, you need to overwrite the original style of the page.
- Quick debugging or temporary repair : During the emergency online or debugging stage, use
!importantto adjust the style first, and then optimize the structure later.
!important and you can quickly get it done. How to use it correctly !important ?
<p> The usage method is actually very simple, just add !important to the end of the style declaration. A few points to note:- It must be immediately followed by the attribute value, before the semicolon.
- Do not add it to selector or attribute names.
- There can only be one
!importantin a rule, and multiple attributes cannot be added.
.button {
background-color: green !important;
color: white !important;
}<p> Wrong writing method?: .button!important { /* Wrong! */
background-color: green;
}
.button {
!important background-color: green; /* Syntax error*/
}What are the alternatives?
<p> Although!important is convenient, a better approach is to override the style by increasing the selector priority, for example:
- Use more specific selectors, such as
.container .buttoninstead of.button - Add class name combination, such as
class="btn primary-btn" - Use the
idselector because it has higher priority than the class
<p> Basically that's it.
!important is not complicated, but is easily misused. It is recommended to use it only when necessary. Usually, it is still possible to manage style priorities by relying on good CSS structure and naming habits.The above is the detailed content of How to override styles with !important CSS tutorial. For more information, please follow other related articles on the PHP Chinese website!
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