CSS opacity() function

Definition and usage

CSS opacity() Filter functions are used to apply transparency effects to elements.

• 100% (or 1) will have no effect
• 50% (or 0.5) will make the element 50% transparent
• 0% (or 0) will make the element completely transparent

Instance

Example 1

Set different transparency for images:

#img1 {
  filter: opacity(80%);
}
#img2 {
  filter: opacity(50%);
}
#img3 {
  filter: opacity(0.2);
}

Try it yourself

Example 2

to opacity() with backdrop-filter Properties used together:

div.transbox {
  background-color: rgba(255, 255, 255, 0.4);
  -webkit-backdrop-filter: opacity(50%);
  backdrop-filter: opacity(50%);
  padding: 20px;
  margin: 30px;
  font-weight: bold;
}

Try it yourself

CSS syntax

opacity(amount)

Technical details

Browser support

The numbers in the table represent the first browser version to fully support this function.

Related pages

Reference:CSS filter attribute

Reference:CSS blur() function

Reference:CSS brightness() function

Reference:CSS contrast() function

Reference:CSS drop-shadow() function

Reference:CSS grayscale() function

Reference:CSS hue-rotate() function

Reference:CSS invert() function

Reference:CSS saturate() function

Reference:CSS sepia() function