Background img css cover

CSS background-size Property

Specify the size of a background-image with «auto» and in pixels:

#example1 <
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: auto;
>

#example2 background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 300px 100px;
>

More «Try it Yourself» examples below.

Definition and Usage

The background-size property specifies the size of the background images.

There are four different syntaxes you can use with this property: the keyword syntax («auto», «cover» and «contain»), the one-value syntax (sets the width of the image (height becomes «auto»), the two-value syntax (first value: width of the image, second value: height), and the multiple background syntax (separated with comma).

Default value: auto
Inherited: no
Animatable: yes. Read about animatable Try it
Version: CSS3
JavaScript syntax: object.style.backgroundSize=»60px 120px» Try it

Browser Support

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

Numbers followed by -webkit-, -moz-, or -o- specify the first version that worked with a prefix.

CSS Syntax

Property Values

Value Description Demo
auto Default value. The background image is displayed in its original size Demo ❯
length Sets the width and height of the background image. The first value sets the width, the second value sets the height. If only one value is given, the second is set to «auto». Read about length units Demo ❯
percentage Sets the width and height of the background image in percent of the parent element. The first value sets the width, the second value sets the height. If only one value is given, the second is set to «auto» Demo ❯
cover Resize the background image to cover the entire container, even if it has to stretch the image or cut a little bit off one of the edges Demo ❯
contain Resize the background image to make sure the image is fully visible 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 size of a background image with percent:

#example1 <
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 100% 100%;
>

#example2 background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 75% 50%;
>

Example

Specify the size of a background image with «cover»:

Example

Specify the size of a background image with «contain»:

Example

Here we have two background images. We specify the size of the first background image with «contain», and the second background-image with «cover»:

#example1 <
background: url(img_tree.gif), url(mountain.jpg);
background-repeat: no-repeat;
background-size: contain, cover;
>

Example

Use different background properties to create a «hero» image:

.hero-image <
background-image: url(«photographer.jpg»); /* The image used */
background-color: #cccccc; /* Used if the image is unavailable */
height: 500px; /* You must set a specified height */
background-position: center; /* Center the image */
background-repeat: no-repeat; /* Do not repeat the image */
background-size: cover; /* Resize the background image to cover the entire container */
>

Источник

background — size

Нужно чтобы фоновая картинка заняла всю площадь элемента? Вам нужно это свойство!

Время чтения: меньше 5 мин

Кратко

Скопировать ссылку «Кратко» Скопировано

Свойство background — size позволяет изменять размер фонового изображения. Если фоновая картинка не совпадает по размеру с размерами блока, то при помощи этого свойства можно сделать так, чтобы она, картинка занимала всю площадь блока или, наоборот, была определённого размера.

Пример

Скопировать ссылку «Пример» Скопировано

Создадим блок и в качестве фона зададим ему красивую панораму:

Фон с красивой панорамой

 div class="element">div>      
 .element  height: 100vh; background-color: #f1f1f1; background-image: url("landscape.jpg"); background-repeat: no-repeat;> .element  height: 100vh; background-color: #f1f1f1; background-image: url("landscape.jpg"); background-repeat: no-repeat; >      

Примеры background-size

Попробуйте поменять размеры фоновой картинки и посмотреть, как будет меняться фоновый паттерн.

Источник

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:

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