.wrapper{
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.button{
  display: block;
  width: 500px;
  height: 40px;
  line-height: 40px;
  font-size: 18px;
  font-family: sans-serif;
  text-decoration: none;
  letter-spacing: 2px;
  text-align: center;
  position: relative;
  transition: all .35s;
  border-radius: 4px;
  vertical-align: middle;
}


.engineering {
  color: #58b12f;
  border: 2px solid #58b12f;
}

.engineering:after {
   background-color: #58b12f;
}

.auto {
  color: #009fee;
  border: 2px solid #009fee;
}

.auto:after {
   background-color: #009fee;
}


.ems {
  color: #FF9933;
  border: 2px solid #FF9933;
}

.ems:after {
   background-color: #FF9933;
}

.ohs {
  color: #00b050;
  border: 2px solid #00b050;
}

.ohs:after {
   background-color: #00b050;
}

.quality {
  color: #a50500;
  border: 2px solid #a50500;
}

.quality:after {
   background-color: #a50500;
}

.employee-portal {
  color: #7030A0;
  border: 2px solid #7030A0;
}

.employee-portal:after {
   background-color: #7030A0;
}


a, a:link, a:visited, a:focus, a:hover, a:active {
    text-decoration:none;
}



.button span{
  position: relative;
  z-index: 2;
  text-decoration: none;
}

.button:after{
  position: absolute;
  content: "";
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  transition: all .35s;
}

.button:hover{
  color: white;
  text-decoration: none;
}

.button:hover:after{
  width: 100%;
  text-decoration: none;
}