rounded gradient border css

  box-sizing: content-box;
  border-width: 8px;
  border-style: solid;
  border-image: linear-gradient(to right bottom, #260B3C, #a053df);
  border-image-slice: 1;

div{
  width: 300px;
  height: 80px;
  border: double 5px transparent;
  border-radius: 30px;
  background-image: linear-gradient(white, white),         /*here must be*/
                    linear-gradient(to right, green, gold);    /*both gradients*/
  background-origin: border-box;
  background-clip: content-box, border-box;
}

.btn-gradient-border {
  color: rgb(var(--text-color));
  border: 2px double transparent;
  background-image: linear-gradient(rgb(13, 14, 33), rgb(13, 14, 33)), radial-gradient(circle at left top, rgb(1, 110, 218), rgb(217, 0, 192));
  background-origin: border-box;
  background-clip: padding-box, border-box;
}