.btn {
  letter-spacing: 0.1em;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  line-height: 45px;
  max-width: 160px;
  position: relative;
  text-decoration: none;
  text-transform: uppercase;
  width: 100%;
}

.btn:hover {
  text-decoration: none;
}

/*btn_background*/
.effect01 {
  color: rgba(0,0,0,1);
  border: 3px solid #000;
  box-shadow:0px 0px 0px 1px #000 inset;
  background-color: rgba(255,255,255,0.7);
  overflow: hidden;
  position: relative;
  transition: all 0.3s ease-in-out;
}

.effect01:hover {
  background-color: #FFF;
  box-shadow:0px 0px 0px 4px #EEE inset;
}

/*btn_text*/
.effect01 span {
  transition: all 0.2s ease-out;
  z-index: 2;
}

.effect01:hover span{
  letter-spacing: 0.13em;
  color: #333;
}

/*highlight*/
.effect01:after {
  background: #FFF;
  border: 0px solid #000;
  content: "";
  height: 155px;
  left: -75px;
  opacity: .8;
  position: absolute;
  top: -50px;
  -webkit-transform: rotate(35deg);
          transform: rotate(35deg);
  width: 50px;
  transition: all 1s cubic-bezier(0.075, 0.82, 0.165, 1);/*easeOutCirc*/
  z-index: 1;
}

.effect01:hover:after {
  background: #FFF;
  border: 20px solid #000;
  opacity: 0;
  left: 120%;
  -webkit-transform: rotate(40deg);
          transform: rotate(40deg);
}