curtisblackwell curtisblackwell - 2 years ago 144
CSS Question

Why do Safari and Firefox seem to incorrectly render my gradient and how can I fix it?

Here's the code on CodePen. It looks exactly as I expect in Chrome. Firefox and Safari both look wrong. (I'm on the latest versions of all 3.)

I'm working on a way to use a constant gradient background across multiple

elements. Here's how it's working right now:

  1. I have a parent
    pseudo-element has a gradient background (
    to opaque color) and a
    set to display it above the child

  2. The
    s have the
    set to the color that looks like what the gradient's
    value is set to.

  3. The
    is set to
    and have
    pseudo-elements that display the text that's previously set to
    and have their z-indices set to display above the
    (with background gradient).

The problems I'm seeing in Firefox:

  1. The gradient looks like it's got 3 color stops (transparent, grey, transparent) instead of the 2 that are set.

  2. The gradient seems as though it's got a multiply blend mode set.

The problems I'm seeing in Safari:

In addition to the same problems in Firefox, it also displays two gradients which seem to have multiply blend modes. One from
and one from
. Solving the issue of the apparent blend mode should take care of this third issue, though.

My googling made me aware of
, but setting that to
(or any other valid value) changed nothing. I think it only works with multiple backgrounds on a single element, but I'm not sure about that. However, that would explain why it doesn't solve my problems.

Answer Source

The problem was that I used the keyword transparent rather than a transparent version of the color that it was gradating to. The browsers that didn't render the gradient as expected were treating transparent as transparent black. That meant that different gradations between black and my color were present in the gradient.

I'm using SASS so the fix is pretty simple: Just use the rgba() function to convert my hex color to rgba.

background-image: linear-gradient(to top right, rgba($brand-primary, 0), $brand-primary);

I updated the code on CodePen to show the solution.

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