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In CSS, you can't transition a background gradient. It jumps from one gradient to the other immediately, with no smooth transition between the two. He documents a clever tactic of positioning a pseudo element covering the element with a different background and transitioning the opacity of that pseudo element.
Linear gradient: It goes down/up/left/right/diagonally and makes smooth transitions of colors. To make a linear transition you first have to choose two color stops. Color stops are the color among which you want to make the transitions. You can also select a starting point and a direction(an angle) for the transition.
First, we add a transparent background image using the background-image property in CSS in the style tag. background-image: url(white. jpg); For the transition background image, we use the transition property in CSS and add a transition to the background image in the style tag.
You can combine a background-image and CSS3 gradient on the same element by using several backgrounds. In our example below, we set the height and width of our <div> and add a background. Then, we set the background image fallback using the “url” value of the background-image property.
Gradients don't support transitions yet (although the current spec says they should support like gradient to like gradient transitions via interpolation.).
If you want a fade-in effect with a background gradient, you have to set an opacity on a container element and 'transition` the opacity.
(There have been some browser releases that supported transitions on gradients (e.g IE10. I tested gradient transitions in 2016 in IE and they seemed to work at the time, but my test code no longer works.)
Update: October 2018 Gradient transitions with un-prefixed new syntax [e.g. radial-gradient(...)]now confirmed to work (again?) on Microsoft Edge 17.17134. I don't know when this was added. Still not working on latest Firefox & Chrome / Windows 10.
One work-around is to transition the background position to give the effect that the gradient is changing: http://sapphion.com/2011/10/css3-gradient-transition-with-background-position/
CSS3 gradient transition with background-position
Although you can’t directly animate gradients using the CSS transition property, it is possible to animate the background-position property to achieve a simple gradient animation:
The code for this is dead simple:
#DemoGradient{
background: -webkit-linear-gradient(#C7D3DC,#5B798E);
background: -moz-linear-gradient(#C7D3DC,#5B798E);
background: -o-linear-gradient(#C7D3DC,#5B798E);
background: linear-gradient(#C7D3DC,#5B798E);
-webkit-transition: background 1s ease-out;
-moz-transition: background 1s ease-out;
-o-transition: background 1s ease-out;
transition: background 1s ease-out;
background-size:1px 200px;
border-radius: 10px;
border: 1px solid #839DB0;
cursor:pointer;
width: 150px;
height: 100px;
}
#DemoGradient:Hover{
background-position:100px;
} <div id="DemoGradient"></div> A solution is to use background-position to mimic the gradient transition. This solution was used in Twitter Bootstrap a few months ago.
Update
http://codersblock.blogspot.fr/2013/12/gradient-animation-trick.html?showComment=1390287622614
Here is a quick example:
Link state
.btn {
font-family: "Helvetica Neue", Arial, sans-serif;
font-size: 12px;
font-weight: 300;
position: relative;
display: inline-block;
text-decoration: none;
color: #fff;
padding: 20px 40px;
background-image: -moz-linear-gradient(top, #50abdf, #1f78aa);
background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#50abdf), to(#1f78aa));
background-image: -webkit-linear-gradient(top, #50abdf, #1f78aa);
background-image: -o-linear-gradient(top, #50abdf, #1f78aa);
background-image: linear-gradient(to bottom, #50abdf, #1f78aa);
background-repeat: repeat-x;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff50abdf', endColorstr='#ff1f78aa', GradientType=0);
background-repeat: repeat-y;
background-size: 100% 90px;
background-position: 0 -30px;
-webkit-transition: all 0.2s linear;
-moz-transition: all 0.2s linear;
-o-transition: all 0.2s linear;
transition: all 0.2s linear;
}
Hover state
.btn:hover {
background-position: 0 0;
}
For what it's worth, here's a Sass mixin:
Usage:
@include gradientAnimation(red, blue, .6s);
Mixin:
@mixin gradientAnimation( $start, $end, $transTime ){
background-size: 100%;
background-image: linear-gradient($start, $end);
position: relative;
z-index: 100;
&:before {
background-image: linear-gradient($end, $start);
content: "";
display: block;
height: 100%;
position: absolute;
top: 0; left: 0;
opacity: 0;
width: 100%;
z-index: -100;
transition: opacity $transTime;
}
&:hover {
&:before {
opacity: 1;
}
}
}
Taken from this awesome post on Medium from Dave Lunny: https://medium.com/@dave_lunny/animating-css-gradients-using-only-css-d2fd7671e759
I know that is old question but mabye someone enjoy my way of solution in pure CSS. Gradient fade from left to right.
.contener{
width:300px;
height:200px;
background-size:cover;
border:solid 2px black;
}
.ed {
width: 0px;
height: 200px;
background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.75));
position: relative;
opacity:0;
transition:width 20s, opacity 0.6s;
}
.contener:hover .ed{
width: 300px;
background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.75));
position: relative;
opacity:1;
transition:width 0.4s, opacity 1.1s;
transition-delay: width 2s;
animation-name: gradient-fade;
animation-duration: 1.1s;
-webkit-animation-name: gradient-fade; /* Chrome, Safari, Opera */
-webkit-animation-duration: 1.1s; /* Chrome, Safari, Opera */
}
/* ANIMATION */
@-webkit-keyframes gradient-fade {
0% {background:linear-gradient(to right, rgba(0,0,255,0), rgba(255,0,0,0));}
2% {background:linear-gradient(to right, rgba(0,0,255,0.01875), rgba(255,0,0,0));}
4% {background:linear-gradient(to right, rgba(0,0,255,0.0375), rgba(255,0,0,0.0));}
6% {background:linear-gradient(to right, rgba(0,0,255,0.05625), rgba(255,0,0,0.0));}
8% {background:linear-gradient(to right, rgba(0,0,255,0.075), rgba(255,0,0,0));}
10% {background:linear-gradient(to right, rgba(0,0,255,0.09375), rgba(255,0,0,0));}
12% {background:linear-gradient(to right, rgba(0,0,255,0.1125), rgba(255,0,0,0));}
14% {background:linear-gradient(to right, rgba(0,0,255,0.13125), rgba(255,0,0,0));}
16% {background:linear-gradient(to right, rgba(0,0,255,0.15), rgba(255,0,0,0));}
18% {background:linear-gradient(to right, rgba(0,0,255,0.16875), rgba(255,0,0,0));}
20% {background:linear-gradient(to right, rgba(0,0,255,0.1875), rgba(255,0,0,0));}
22% {background:linear-gradient(to right, rgba(0,0,255,0.20625), rgba(255,0,0,0.01875));}
24% {background:linear-gradient(to right, rgba(0,0,255,0.225), rgba(255,0,0,0.0375));}
26% {background:linear-gradient(to right, rgba(0,0,255,0.24375), rgba(255,0,0,0.05625));}
28% {background:linear-gradient(to right, rgba(0,0,255,0.2625), rgba(255,0,0,0.075));}
30% {background:linear-gradient(to right, rgba(0,0,255,0.28125), rgba(255,0,0,0.09375));}
32% {background:linear-gradient(to right, rgba(0,0,255,0.3), rgba(255,0,0,0.1125));}
34% {background:linear-gradient(to right, rgba(0,0,255,0.31875), rgba(255,0,0,0.13125));}
36% {background:linear-gradient(to right, rgba(0,0,255,0.3375), rgba(255,0,0,0.15));}
38% {background:linear-gradient(to right, rgba(0,0,255,0.35625), rgba(255,0,0,0.16875));}
40% {background:linear-gradient(to right, rgba(0,0,255,0.375), rgba(255,0,0,0.1875));}
42% {background:linear-gradient(to right, rgba(0,0,255,0.39375), rgba(255,0,0,0.20625));}
44% {background:linear-gradient(to right, rgba(0,0,255,0.4125), rgba(255,0,0,0.225));}
46% {background:linear-gradient(to right, rgba(0,0,255,0.43125),rgba(255,0,0,0.24375));}
48% {background:linear-gradient(to right, rgba(0,0,255,0.45), rgba(255,0,0,0.2625));}
50% {background:linear-gradient(to right, rgba(0,0,255,0.46875), rgba(255,0,0,0.28125));}
52% {background:linear-gradient(to right, rgba(0,0,255,0.4875), rgba(255,0,0,0.3));}
54% {background:linear-gradient(to right, rgba(0,0,255,0.50625), rgba(255,0,0,0.31875));}
56% {background:linear-gradient(to right, rgba(0,0,255,0.525), rgba(255,0,0,0.3375));}
58% {background:linear-gradient(to right, rgba(0,0,255,0.54375), rgba(255,0,0,0.35625));}
60% {background:linear-gradient(to right, rgba(0,0,255,0.5625), rgba(255,0,0,0.375));}
62% {background:linear-gradient(to right, rgba(0,0,255,0.58125), rgba(255,0,0,0.39375));}
64% {background:linear-gradient(to right,rgba(0,0,255,0.6), rgba(255,0,0,0.4125));}
66% {background:linear-gradient(to right, rgba(0,0,255,0.61875), rgba(255,0,0,0.43125));}
68% {background:linear-gradient(to right, rgba(0,0,255,0.6375), rgba(255,0,0,0.45));}
70% {background:linear-gradient(to right, rgba(0,0,255,0.65625), rgba(255,0,0,0.46875));}
72% {background:linear-gradient(to right, rgba(0,0,255,0.675), rgba(255,0,0,0.4875));}
74% {background:linear-gradient(to right, rgba(0,0,255,0.69375), rgba(255,0,0,0.50625));}
76% {background:linear-gradient(to right, rgba(0,0,255,0.7125), rgba(255,0,0,0.525));}
78% {background:linear-gradient(to right, rgba(0,0,255,0.73125),,rgba(255,0,0,0.54375));}
80% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.5625));}
82% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.58125));}
84% {background:linear-gradient(to right, rgba(0,0,255,0.75),rgba(255,0,0,0.6));}
86% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.61875));}
88% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.6375));}
90% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.65625));}
92% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.675));}
94% {background:linear-gradient(to right, rgba(0,0,255,0.75),rgba(255,0,0,0.69375));}
96% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.7125));}
98% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.73125),);}
100% {background:linear-gradient(to right, rgba(0,0,255,0.75), rgba(255,0,0,0.75));}
}<div class="contener" style="">
<div class="ed"></div>
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