Max Hartshorn Max Hartshorn - 5 months ago 13
CSS Question

iOS Safari: CSS gradient too dark when placed over similarly colored background

I have a blue box. I want to place a gradient overlay that fades from transparent to blue at the bottom of this blue box, so that overflowing text gradually fades out at the bottom.

Here's what it should look like (and does look like on most browsers):

enter image description here

Here's what it looks like on iOS Safari:

enter image description here

I've created a fiddle to demonstrate this issue: https://jsfiddle.net/cy89ocrs/11/

background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, rgba(0, 0, 0, 0)), color-stop(100%, #034b81));
background-image: -moz-linear-gradient(rgba(0, 0, 0, 0), #034b81);
background-image: -webkit-linear-gradient(rgba(0, 0, 0, 0), #034b81);
background-image: linear-gradient(rgba(0, 0, 0, 0), #034b81);


As you can see the color that is being faded to in Safari is darker, even though it is the same color. So when there's not enough text the fader is still awkwardly visible. Is there any way to fix this so Safari displays gradients like other browsers?

Answer

Safari is rendering correctly.

With linear-gradient you can define:

linear-gradient( 
  [ <angle> | to <side-or-corner> ,]? <color-stop> [, <color-stop>]+ )
  \---------------------------------/ \----------------------------/
    Definition of the gradient line        List of color stops  

where <side-or-corner> = [left | right] || [top | bottom]
  and <color-stop>     = <color> [ <percentage> | <length> ]?

So your gradient goes from black with zero opacity (rgba(0,0,0,0)) to your desired color (#034b81).

See: rgba(red,green,blue,opacity)

That's why you see that black line in Safari.

To achieve your desired appearance, just change the rgba value to the value of your color. so your code should look like:

background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, rgba(3, 75, 129, 0)), color-stop(100%, #034b81));
background-image: -moz-linear-gradient(rgba(3, 75, 129, 0), #034b81);
background-image: -webkit-linear-gradient(rgba(3, 75, 129, 0), #034b81);
background-image: linear-gradient(rgba(3, 75, 129, 0), #034b81);

Demo

div {
  position: relative;
  width: 100%;
  height: 300px;
  background-color: #034b81;
  color: white;
  overflow: hidden;
}
div:after {
  content: ' ';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 25px;
  background-size: 100%;
  background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, rgba(3, 75, 129, 0)), color-stop(100%, #034b81));
  background-image: -moz-linear-gradient(rgba(3, 75, 129, 0), #034b81);
  background-image: -webkit-linear-gradient(rgba(3, 75, 129, 0), #034b81);
  background-image: linear-gradient(rgba(3, 75, 129, 0), #034b81);
}
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