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<a href="#"><span>Button</span></a>

body{
  margin: 0;
  padding: 0;
  font-family: verdana;
}
a{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  font-size: 20px;
  color: #262626;
  padding: 10px 30px;
  border: 2px solid #262626;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 4px;
  transition: .5s;
  overflow: hidden;
}
a:before,
a:after,
span:before,
span:after{
  content: '';
  position: absolute;
  width: 25.5%;
  height: 100%;
  background: #262626;
  z-index: -1;
  transition: .5s;
}
a:before{
  top: 0;
  left: -26%;
}
a:after{
  top: 0;
  right: -26%;
}
span:before{
  bottom: -100%;
  left: 25%;
}
span:after{
  top: -100%;
  left: 50%;
}

a:hover:before{
  top: 0;
  left: 0;
}
a:hover:after{
  top: 0;
  right: 0;
}
a:hover span:before{
  bottom: 0;
  left: 25%;
}
a:hover span:after{
  top: 0;
  left: 50%;
}
a:hover{
  color: #fff;
}