In my case, I want to achieve exactly same thing and don't know how I'm suppose to do that.
.apply-button {
position: absolute;
margin-top: 8rem;
border-radius: 5em;
box-shadow: 0 8px 4px 0 rgba(0, 0, 0, 0.25);
border-style: solid;
border-width: 0.275rem;
border-image-slice: 0;
border-image-source: linear-gradient(to top, #0270bb, #c6e357, rgba(255, 153, 0, 0.9));
background-origin: border-box;
background-clip: content-box, border-box;
background-image: linear-gradient(to bottom, #ffffff, #ffffff), linear-gradient(to top, #0270bb, #c6e357, rgba(255, 153, 0, 0.9));
}
<a role="button" class="apply-button" href="#"><p>apply</p></a>

