Css background color fill margin

background-size

The background-size CSS property sets the size of the element’s background image. The image can be left to its natural size, stretched, or constrained to fit the available space.

Try it

Spaces not covered by a background image are filled with the background-color property, and the background color will be visible behind background images that have transparency/translucency.

Syntax

/* Keyword values */ background-size: cover; background-size: contain; /* One-value syntax */ /* the width of the image (height becomes 'auto') */ background-size: 50%; background-size: 3.2em; background-size: 12px; background-size: auto; /* Two-value syntax */ /* first value: width of the image, second value: height */ background-size: 50% auto; background-size: 3em 25%; background-size: auto 6px; background-size: auto auto; /* Multiple backgrounds */ background-size: auto, auto; /* Not to be confused with `auto auto` */ background-size: 50%, 25%, 25%; background-size: 6px, auto, contain; /* Global values */ background-size: inherit; background-size: initial; background-size: revert; background-size: revert-layer; background-size: unset; 

The background-size property is specified in one of the following ways:

• Using the keyword values contain or cover .
• Using a width value only, in which case the height defaults to auto .
• Using both a width and a height value, in which case the first sets the width and the second sets the height. Each value can be a , a , or auto .

To specify the size of multiple background images, separate the value for each one with a comma.

Values

Scales the image as large as possible within its container without cropping or stretching the image. If the container is larger than the image, this will result in image tiling, unless the background-repeat property is set to no-repeat .

Scales the image (while preserving its ratio) to the smallest possible size to fill the container (that is: both its height and width completely cover the container), leaving no empty space. If the proportions of the background differ from the element, the image is cropped either vertically or horizontally.

Scales the background image in the corresponding direction such that its intrinsic proportions are maintained.

Stretches the image in the corresponding dimension to the specified length. Negative values are not allowed.

Stretches the image in the corresponding dimension to the specified percentage of the background positioning area. The background positioning area is determined by the value of background-origin (by default, the padding box). However, if the background’s background-attachment value is fixed , the positioning area is instead the entire viewport. Negative values are not allowed.

Intrinsic dimensions and proportions

The computation of values depends on the image’s intrinsic dimensions (width and height) and intrinsic proportions (width-to-height ratio). These attributes are as follows:

• A bitmap image (such as JPG) always has intrinsic dimensions and proportions.
• A vector image (such as SVG) does not necessarily have intrinsic dimensions. If it has both horizontal and vertical intrinsic dimensions, it also has intrinsic proportions. If it has no dimensions or only one dimension, it may or may not have proportions.
• CSS s have no intrinsic dimensions or intrinsic proportions.
• Background images created with the element() function use the intrinsic dimensions and proportions of the generating element.

Note: In Gecko, background images created using the element() function are currently treated as images with the dimensions of the element, or of the background positioning area if the element is SVG, with the corresponding intrinsic proportion. This is non-standard behavior.

Based on the intrinsic dimensions and proportions, the rendered size of the background image is computed as follows:

• If both components of background-size are specified and are not auto : The background image is rendered at the specified size.
• If the background-size is contain or cover : While preserving its intrinsic proportions, the image is rendered at the largest size contained within, or covering, the background positioning area. If the image has no intrinsic proportions, then it’s rendered at the size of the background positioning area.
• If the background-size is auto or auto auto :
  • If the image has both horizontal and vertical intrinsic dimensions, it’s rendered at that size.
  • If the image has no intrinsic dimensions and has no intrinsic proportions, it’s rendered at the size of the background positioning area.
  • If the image has no intrinsic dimensions but has intrinsic proportions, it’s rendered as if contain had been specified instead.
  • If the image has only one intrinsic dimension and has intrinsic proportions, it’s rendered at the size corresponding to that one dimension. The other dimension is computed using the specified dimension and the intrinsic proportions.
  • If the image has only one intrinsic dimension but has no intrinsic proportions, it’s rendered using the specified dimension and the other dimension of the background positioning area.

  Note: SVG images have a preserveAspectRatio attribute that defaults to the equivalent of contain ; an explicit background-size causes preserveAspectRatio to be ignored.

  • If the image has intrinsic proportions, it’s stretched to the specified dimension. The unspecified dimension is computed using the specified dimension and the intrinsic proportions.
  • If the image has no intrinsic proportions, it’s stretched to the specified dimension. The unspecified dimension is computed using the image’s corresponding intrinsic dimension, if there is one. If there is no such intrinsic dimension, it becomes the corresponding dimension of the background positioning area.

  Note: Background sizing for vector images that lack intrinsic dimensions or proportions is not yet fully implemented in all browsers. Be careful about relying on the behavior described above, and test in multiple browsers to be sure the results are acceptable.

  Formal definition

  Initial value	auto auto
  Applies to	all elements. It also applies to ::first-letter and ::first-line .
  Inherited	no
  Percentages	relative to the background positioning area
  Computed value	as specified, but with relative lengths converted into absolute lengths
  Animation type	a repeatable list of

  Formal syntax

  Examples

  Tiling a large image

  Let’s consider a large image, a 2982×2808 Firefox logo image. We want to tile four copies of this image into a 300×300-pixel element. To do this, we can use a fixed background-size value of 150 pixels.

  HTML

  div class="tiledBackground">div> 

  CSS

  .tiledBackground  background-image: url(https://www.mozilla.org/media/img/logos/firefox/logo-quantum.9c5e96634f92.png); background-size: 150px; width: 300px; height: 300px; border: 2px solid; color: pink; > 

  Result

  Specifications

  Browser compatibility

  BCD tables only load in the browser

  See also

  Found a content problem with this page?

  This page was last modified on Jul 18, 2023 by MDN contributors.

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  Portions of this content are ©1998– 2023 by individual mozilla.org contributors. Content available under a Creative Commons license.

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  CSS background-color Property

  The background-color property sets the background color of an element.

  The background of an element is the total size of the element, including padding and border (but not the margin).

  Tip: Use a background color and a text color that makes the text easy to read.

  Default value:	transparent
  Inherited:	no
  Animatable:	yes. Read about animatable Try it
  Version:	CSS1
  JavaScript syntax:	object.style.backgroundColor=»#00FF00″ Try it

  Browser Support

  The numbers in the table specify the first browser version that fully supports the property.

  CSS Syntax

  Property Values

  Value	Description	Demo
  color	Specifies the background color. Look at CSS Color Values for a complete list of possible color values.	Demo ❯
  transparent	Specifies that the background color should be transparent. This is default	Demo ❯
  initial	Sets this property to its default value. Read about initial
  inherit	Inherits this property from its parent element. Read about inherit

  More Examples

  Example

  Specify the background color with a HEX value:

  Example

  Specify the background color with an RGB value:

  Example

  Specify the background color with an RGBA value:

  Example

  Specify the background color with a HSL value:

  Example

  Specify the background color with a HSLA value:

  Example

  Set background colors for different elements:

  body <
  background-color: #fefbd8;
  >

  h1 background-color: #80ced6;
  >

  div background-color: #d5f4e6;
  >

  span background-color: #f18973;
  >

  Источник

  background-color

  The background-color CSS property sets the background color of an element.

  Try it

  Syntax

  /* Keyword values */ background-color: red; background-color: indigo; /* Hexadecimal value */ background-color: #bbff00; /* Fully opaque */ background-color: #bf0; /* Fully opaque shorthand */ background-color: #11ffee00; /* Fully transparent */ background-color: #1fe0; /* Fully transparent shorthand */ background-color: #11ffeeff; /* Fully opaque */ background-color: #1fef; /* Fully opaque shorthand */ /* RGB value */ background-color: rgb(255 255 128); /* Fully opaque */ background-color: rgb(117 190 218 / 0.5); /* 50% transparent */ /* HSL value */ background-color: hsl(50 33% 25%); /* Fully opaque */ background-color: hsl(50 33% 25% / 0.75); /* 75% opaque, i.e. 25% transparent */ /* Special keyword values */ background-color: currentcolor; background-color: transparent; /* Global values */ background-color: inherit; background-color: initial; background-color: revert; background-color: revert-layer; background-color: unset; 

  The background-color property is specified as a single value.

  Values

  The uniform color of the background. It is rendered behind any background-image that is specified, although the color will still be visible through any transparency in the image.

  Accessibility concerns

  It is important to ensure that the contrast ratio between the background color and the color of the text placed over it is high enough that people experiencing low vision conditions will be able to read the content of the page.

  Color contrast ratio is determined by comparing the luminance of the text and background color values. In order to meet current Web Content Accessibility Guidelines (WCAG), a ratio of 4.5:1 is required for text content and 3:1 for larger text such as headings. Large text is defined as 18.66px and bold or larger, or 24px or larger.

  Formal definition

  Formal syntax

  Examples

  HTML

  div class="exampleone">Lorem ipsum dolor sit amet, consectetuerdiv> div class="exampletwo">Lorem ipsum dolor sit amet, consectetuerdiv> div class="examplethree">Lorem ipsum dolor sit amet, consectetuerdiv> 

  CSS

  .exampleone  background-color: transparent; > .exampletwo  background-color: rgb(153, 102, 153); color: rgb(255, 255, 204); > .examplethree  background-color: #777799; color: #ffffff; > 

  Result

  Specifications

  Browser compatibility

  BCD tables only load in the browser

  See also

  Found a content problem with this page?

  This page was last modified on Jul 18, 2023 by MDN contributors.

  Your blueprint for a better internet.

  MDN

  Support

  Our communities

  Developers

  Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.
  Portions of this content are ©1998– 2023 by individual mozilla.org contributors. Content available under a Creative Commons license.

  Источник