is it possible to do a curved line with css gradient? - html

Question

I have this design from a client with two layers of gradients in a button. The tricky thing is, one of the layers has a curved edge. I've mocked up the button so you have a sense of what I'm saying, hopefully.
What I managed to do is a straight edge (see code snippet, color difference is not important, just need the curve). Does anyone have done this before? Or does it have to be a background image? Thanks!
P.S. I also thought about using radial gradient on a pseudo element and absolute position it, but couldn't get the exact straight edge look like the linear gradient.
a {
background-image: linear-gradient(-155deg,rgba(74,148,214,.4) 45%,rgba(255,255,255,.08) 15%),linear-gradient(258deg,rgba(87,238,255,.1),rgba(77,108,211,.2));
background-color: rgba(74,148,214,.9);
color: #fff;
width: 200px;
height: 40px;
border-radius: 10px;
margin-top: 50px;
display: block;
text-align: center;
line-height: 40px;
}
<a>
Some button
</a>

Answer 1

You can get pretty close by using a radial-gradient instead of linear:
a {
background-image:
radial-gradient(ellipse farthest-corner at 0 140%, #3c84cc 0%, #316dc2 70%, #4e95d3 70%);
color: white;
width: 200px;
height: 50px;
border-radius: 10px;
margin-top: 50px;
display: block;
text-align: center;
line-height: 50px;
}
<a>
Some button
</a>

Answer 2

You can use a pseudo element to draw the curve using a circle, then just use whatever gradient you want as the background(s)
a {
background-color: lightblue;
color: #fff;
width: 200px;
height: 40px;
border-radius: 10px;
margin-top: 50px;
display: block;
text-align: center;
line-height: 40px;
position: relative;
z-index: 1;
overflow: hidden;
}
a:after {
content: '';
position: absolute;
background-color: blue;
width: 600px;
height: 200px;
border-radius: 50%;
top: 0;
left: 0;
transform: translate(-49%,0);
z-index: -1;
}
<a>
Some button
</a>

Answer 3

I just modified a bit #Blazemonger's post.
I fixed the position of the curved line.
a {
background-image: radial-gradient(ellipse farthest-corner at -10% 250%, #3c84cc 0%, #315dc2 80%, #4e95d3 80%);
color: white;
width: 200px;
height: 50px;
border-radius: 10px;
margin-top: 50px;
display: block;
text-align: center;
line-height: 50px;
}
<a>Some button</a>