CSS linear-gradient() Function

Using CSS gradients
CSS linear-gradient() Function
.single-slider::before {
  background: rgba(0, 0, 0, 0) linear-gradient(to top, #0575e6, #00f260) repeat scroll 0 0;
  content: "";
  height: 100%;
  left: 0;
  opacity: 0.8;
  position: absolute;
  top: 0;
  width: 100%;
  z-index: 1;
}