.button_slide {
  border: 2px solid #000;
  border-radius: 0px;
  padding: 18px 36px;
  display: inline-block;
  font-family: 'Lucida Console', Monaco, monospace;
  font-size: 14px;
  letter-spacing: 1px;
  cursor: pointer;
  box-shadow: inset 0 0 0 0 #000;
  -webkit-transition: ease-out 0.4s;
  -moz-transition: ease-out 0.4s;
  transition: ease-out 0.4s;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 140px;
  z-index: 999999;
}

.button_slide a {
  text-decoration: none;
  color: #000;
  transition: inherit;
}

.slide_right:hover {
  box-shadow: inset 400px 0 0 0 #000;
}

.slide_right:hover a {
  color: #fff;
}