.btn-slide {
  position: relative;
  overflow: hidden;
  z-index: 1;
  transition: color 0.4s ease;
}

/* Create the background slide layer */

.btn-slide::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: #dda600;
  transition: left 0.4s ease;
  z-index: -1;
}

/* Move background inside on hover */

.btn-slide:hover::before {
  left: 0;
}

.btn-slide:hover {
  color: #fff !important;
}