.button.one:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background-color: rgba(255,255,255,0.4);
	-webkit-transition: none;
	   -moz-transition: none;
	        transition: none;
}
.button.one:hover:after {
  width: 120%;
  background-color: rgba(255,255,255,0);
  
	-webkit-transition: all 0.4s ease-in-out;
	   -moz-transition: all 0.4s ease-in-out;
	        transition: all 0.4s ease-in-out;
}

/* Two */
.button.two {
  background-repeat: no-repeat;
  background-position: -120px -120px, 0 0;
  
  background-image: -webkit-linear-gradient(
    top left,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.2) 37%,
    rgba(255, 255, 255, 0.8) 45%,
    rgba(255, 255, 255, 0.0) 50%
  );
  background-image: -moz-linear-gradient(
    0 0,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.2) 37%,
    rgba(255, 255, 255, 0.8) 45%,
    rgba(255, 255, 255, 0.0) 50%
  );    
  background-image: -o-linear-gradient(
    0 0,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.2) 37%,
    rgba(255, 255, 255, 0.8) 45%,
    rgba(255, 255, 255, 0.0) 50%
  );
  background-image: linear-gradient(
    0 0,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.2) 37%,
    rgba(255, 255, 255, 0.8) 45%,
    rgba(255, 255, 255, 0.0) 50%
  );
  
  -moz-background-size: 250% 250%, 100% 100%;
       background-size: 250% 250%, 100% 100%;
  
  -webkit-transition: background-position 0s ease;
     -moz-transition: background-position 0s ease;       
       -o-transition: background-position 0s ease;
          transition: background-position 0s ease;
}

.button.two:hover {
  background-position: 0 0, 0 0;
  
  -webkit-transition-duration: 0.5s;
     -moz-transition-duration: 0.5s;
          transition-duration: 0.5s;
}