Delete css style

CSS is a very important part of web design. It can beautify and improve the appearance, style and layout of web pages. But sometimes, we may encounter situations where we need to delete some CSS styles.

Possible situations when deleting CSS styles:

1. Duplicate styles

When you use the same style two or more times, this may cause the style to change. Conflicts or unexpected results appear on the page. Therefore, it is necessary to remove some duplicate styles.

For example:

h1{
  font-size: 18px;
  color: blue;
  text-align: center;
}

h1{
  color: red;
}

The above CSS will cause the font color of the h1 tag to be red instead of blue. At this time, you need to delete the style of the second h1 tag and keep the first one.

2. Unnecessary styles

In the style sheet, sometimes we will define some unnecessary styles. These styles will not be used at all. They may be used to implement a certain Temporarily added for effect. Removing it can reduce file size and load faster.

For example:

h1{
  font-size: 18px;
  color: blue;
  text-align: center;
  margin-top: 20px;
}

h2{
  font-size: 16px;
  color: green;
}

p{
  font-size: 16px;
  color: black;
}

In the above CSS, the h2 tag is not used and can be deleted. At the same time, if the p tag is only used in a specific page, you can place it separately in the style sheet of that page to avoid it being loaded in other pages and wasting resources.

3. Styles that do not match the design

Sometimes, during the web design process, we may try many different styles, but in the end not all styles can achieve the expected effect. Or it doesn’t match the design. At this time, these invalid or inappropriate styles need to be deleted.

For example:

.container{
  width: 1000px;
  padding: 20px;
  box-sizing: border-box;
  border: solid 1px black;
}

.title{
  font-size: 20px;
  color: blue;
  text-align: center;
  margin-top: 30px;
}

.btn{
  font-size: 16px;
  color: white;
  background-color: blue;
  border-radius: 5px;
  padding: 5px 10px;
}

.btn:hover{
  background-color: red;
  color: white;
}

In the above CSS code, the .btn:hover style defines the effect when the mouse moves over the button, but this design may not conform to the designer's intention requirement, so this effect needs to be deleted.

Summary: Removing CSS styles is an important web optimization tip that can reduce file size and improve web page loading speed. Removing duplicate, unnecessary, and design-inconsistent styles can improve the efficiency and readability of styles while avoiding style conflict issues. Always review your style sheet to make sure the styles are reasonable and effective.

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