Is it possible to make a blurred gradient shadow with CSS? - css

Question

Here is a shadow:
So I need this to be a shadow which appears on button hover. I know its css but I didn't manage to make any blur:
background-image: linear-gradient(-90deg, #CF77F3 0%, #009BFF 47%, #2AC9DB 100%);
border-radius: 100px;
filter: blur(5px);
So, two basic questions:
Is it possible to make this blurred thing with CSS?
If yes, is it possible to make it a button shadow? Or how else can I solve this? One thought was to just make a png with absolute positioning, which is hacky a bit
update
So the final result I want achieve looks something like this:
The shadow repeats button gradient which is
linear-gradient(-90deg, #CF77F3 0%, #009BFF 47%, #2AC9DB 100%);

Answer 1

New answer
I have made an online generator that helps you get a gradient shadow easily: https://css-generators.com/gradient-shadows/
All you have to do is to adjust a few values and get the code:
button {
margin: 50px;
border-radius: 999px;
padding: 10px 30px;
font-size: 25px;
color: #fff;
text-align: center;
line-height: 50px;
border: none;
background: linear-gradient(-90deg, #CF77F3 0%, #009BFF 47%, #2AC9DB 100%);
position: relative;
transform-style: preserve-3d;
}
button::before {
content: "";
position: absolute;
inset: -10px;
background: inherit;
filter: blur(20px);
transform: translate3d(15px,15px,-1px);
border-radius: inherit;
pointer-events: none;
}
<button >
this a button
</button>
More detail: https://css-tricks.com/different-ways-to-get-css-gradient-shadows/
Old answer
What about multiple box-shadow:
.box {
margin:50px;
width:100px;
height:50px;
border-radius:20px;
color:#fff;
text-align:center;
line-height:50px;
box-shadow:
20px 5px 40px #CF77F3,
0px 5px 40px #009BFF,
-20px 5px 40px #2AC9DB;
background-image: linear-gradient(-90deg, #CF77F3 0%, #009BFF 47%, #2AC9DB 100%);
}
<div class="box">
this a button
</div>

Answer 2

You can get this effect in modern browsers using a pseudo element with the same background, and a filter blur applied on it.
To get compatibility with IE, you can set also a pseudo, and to get the blurred borders use an inset shadow. At least in Chrome, there is a small left over of the border that still can be seen.
.test {
margin: 20px;
background-image: linear-gradient(-90deg, #CF77F3 0%, #009BFF 47%, #2AC9DB 100%);;
border-radius: 50px;
display: inline-block;
height: 100px;
width: 200px;
position: relative;
border: solid 4px black;
}
#test1:after {
content: "";
position: absolute;
background-image: inherit;
border-radius: inherit;
width: inherit;
height: inherit;
transform: translate(0px, 20px) scale(1.1);
z-index: -1;
filter: blur(14px);
}
#test2:after {
content: "";
position: absolute;
border-radius: 90px;
width: 250px;
height: 150px;
z-index: -1;
top: 1px;
left: -25px;
background-image: linear-gradient(-90deg, #CF77F3 0%, #009BFF 47%, #2AC9DB 100%);
box-shadow: inset 0px 0px 25px 18px white;
}
<div class="test" id="test1">
</div>
<div class="test" id="test2">
</div>