The opacity function

The opacity function allows you to change a transparency of the background image. The value of 100% or 1 leaves the image at its original transparency. The value of 0 means that the image will become completely transparent. Any number located in this range specifies partial transparency of the background. A negative value cannot be specified. The default value is 1.

Syntax

cssselector {
  filter: opacity(number);
}

Example

Let's set the transparency of our image to 50%:

html<div id="elem"></div>

css#elem {
  filter: opacity(50%);
  background: url("bg.png") center / cover no-repeat;
  width: 400px;
  height: 300px;
  border: 1px solid black;
}

Результат:

Example

Now let's set the transparency to 100%:

html<div id="elem"></div>

css#elem {
  filter: opacity(100%);
  background: url("bg.png") center / cover no-repeat;
  width: 400px;
  height: 300px;
  border: 1px solid black;
}

Результат:

Example

Now let's set the opacity function to a value equal to 0:

html<div id="elem"></div>

css#elem {
  filter: opacity(0);
  background: url("bg.png") center / cover no-repeat;
  width: 400px;
  height: 300px;
  border: 1px solid black;
}

Результат:

See also