CSS border-bottom Detailed explanation of attributes

border-bottom Properties are shorthand properties in CSS, which are used to set the width, style, and color of the bottom border of an element at the same time. The border is located above the element background.

Grammar:

border-bottom: [ <border-width> ] [ <border-style> ] [ <border-color> ] | inherit;

Instructions:

This property allows you to set three properties of the bottom border at one time: border-bottom-width, border-bottom-style and border-bottom-color. You can specify only one or more of the properties, and unspecified properties will use the default values. It should be noted that if border-style is omitted, the default value is none and no borders are displayed. Therefore, it is best practice to always specify border styles when using abbreviation.

Attribute value:

• <border-width>: Border width, you can use pixels (px), em, rem, percentage (%) and other units. Negative value is invalid.
• <border-style>: Border styles, such as none, hidden, dotted, dashed, solid, double, groove, ridge, inset, outset,
,
• , , ??> and <border-color>.

: Border color, you can use hexadecimal color values, RGB, RGBA, HSL, HSLA, or predefined color names.

#example p {
  border-bottom: 2px solid blue;
}

The following code will set a 2-pixel-wide blue solid line bottom border for paragraphs within an element with ID "example":

• How to change the color of the bottom border? Use the border-bottom-color attribute, such as border-bottom-color: red;.
• How to use different bottom border styles? Use the border-bottom-style attribute, such as border-bottom-style: dotted;.
• How to set the bottom border width? Use the border-bottom-width attribute, such as border-bottom-width: 2px;.
• How to set the bottom border properties using abbreviation? Use the border-bottom attribute, such as border-bottom: 2px dashed green;.
• How to remove the bottom border? Set border-bottom-style to none, for example border-bottom-style: none; or border-bottom: none;.
• How to set different borders for different edges of an element? Use the border-top, border-right, border-bottom, and border-left properties to set the top, right, bottom, and left borders respectively.
• How to create a bottom border with a gradient color? CSS itself does not support gradient borders, and needs to be implemented using pseudo-elements and linear gradients.
• How to animate the bottom border properties? Use the @keyframes and animation properties to animation the properties such as border-bottom-color, border-bottom-width and border-bottom-style.
• How to create a double-line bottom border? Set border-bottom-style to double, for example border-bottom-style: double;.
• How to create dividers using bottom borders? By setting the width and color of border-bottom, you can create dividers that separate different areas of a web page.

First flexibly use the border-bottom properties and their related properties, you can easily create various styles of bottom borders to enhance the visual effects and user experience of the web page.

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