.hbtn {
  position: relative;
  box-sizing: border-box;
  display: inline-block;
  overflow: hidden;
  padding: 15px 40px;
  margin: 0 3px 6px 3px;
  text-align: center;
  text-decoration: none;
  background: #ff330d;
  white-space: nowrap;
  z-index: 0;
  border-radius: 4px;
  display: flex;
  border-radius: 10px;
}

.hb-fill-right:hover {
  color: #000000;
  background: #ff330d;
  transition: color 0.3s ease, background 0s 0.3s ease;
}

.hbtn.hb-fill-right:before {
  position: absolute;
  content: "";
  background: #23a49a;
  transition-duration: 0.3s;
  z-index: -1;
  top: 0;
  right: auto;
  bottom: auto;
  left: 0;
  width: 0;
  height: 100%;
  opacity: 1;
}

.hbtn.hb-fill-right:hover:before {
  width: 100%;
  height: 100%;
  opacity: 1;
}