How to combine two css3 gradients ?

Question

I've Two CSS for HTML BODY Background I'm using this css as background of my page ; i want to overlap these two and get combined effect?

    /* IE10 Consumer Preview */ 
background-image: -ms-linear-gradient(top, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* Mozilla Firefox */ 
background-image: -moz-linear-gradient(top, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* Opera */ 
background-image: -o-linear-gradient(top, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* Webkit (Safari/Chrome 10) */ 
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #FFFFFF), color-stop(0.5, #FFFFFF), color-stop(0.75, #FFFFFF), color-stop(1, #A3EF69));

/* Webkit (Chrome 11+) */ 
background-image: -webkit-linear-gradient(top, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* W3C Markup, IE10 Release Preview */ 
background-image: linear-gradient(to bottom, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

second one is

/* IE10 Consumer Preview */ 
background-image: -ms-linear-gradient(bottom, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* Mozilla Firefox */ 
background-image: -moz-linear-gradient(bottom, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* Opera */ 
background-image: -o-linear-gradient(bottom, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* Webkit (Safari/Chrome 10) */ 
background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0, #FFFFFF), color-stop(0.5, #FFFFFF), color-stop(0.75, #FFFFFF), color-stop(1, #A3EF69));

/* Webkit (Chrome 11+) */ 
background-image: -webkit-linear-gradient(bottom, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

/* W3C Markup, IE10 Release Preview */ 
background-image: linear-gradient(to top, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

How can i combine these two into one?

Answer 1

Two Issues with Your Code

First, the two images must be called within a single background-image call, otherwise the way the "cascading" part of CSS works the second one will just override the first. So the first thing that needs changing is to make all of the calls grouped like this (each successive call separated by commas):

background-image: 
  linear-gradient(top, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%), 
  linear-gradient(bottom, #FFFFFF 0%, #FFFFFF 50%, #FFFFFF 75%, #A3EF69 100%);

This is what the possible duplicate question noted to do, and that is correct, but it probably did not work for you because...

Second, each of those gradient images you have defined are non-transparent, so one of them will "over paint" on top of the other and effectively give you just one image. I think what you really want is a fade effect, which will require you to use alpha opacity to achieve. So every instance of #FFFFFF needs to change to rgba(255, 255, 255, 0), then you get the blending I believe you seek:

background-image: 
  linear-gradient(top, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0) 50%,
    rgba(255, 255, 255, 0) 75%, #A3EF69 100%), 
  linear-gradient(bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0) 50%, 
    rgba(255, 255, 255, 0) 75%, #A3EF69 100%);