a.boot2021 {
  -webkit-transform: translate3D(0, 0, 0);
  -webkit-backface-visibility: hidden;
  color: white;
  background-color: #84cd1b;
  padding: 12px 12px 12px;
  font-family: "Helvetica";
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 16px;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  display:block;
  width:650px;
  text-align:center;
}
a.boot2021:after {
  padding: 0;
  content: '';
  width: 100%;
  height: 60px;
  display: block;
  position: absolute;
  z-index: -2;
  top: 0;
  left: 0;
}
a.boot2021:before {
  -webkit-transition: all 0s ease-in-out;
  -moz-transition: all 0s ease-in-out;
  -o-transition: all 0s ease-in-out;
  transition: all 0s ease-in-out;
  content: '';
  width: 100%;
  height: 60px;
  display: block;
  position: absolute;
  z-index: -1;
  border-left: 15px solid white;
  box-shadow: -20px 30px 30px white;
  background: transparent;
  top: 0px;
  left: -15px;
  margin-left: 0px;
  -webkit-transform: translate(0, 0);
  -moz-transform: translate(0, 0);
  -ms-transform: translate(0, 0);
  -o-transform: translate(0, 0);
  transform: translate(0, 0);
}
 a.boot2021:hover:before, a.boot2021:active:before, a.boot2021:focus:before {
  -webkit-transition: all 0.4s ease-in-out;
  -moz-transition: all 0.4s ease-in-out;
  -o-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
  -webkit-transform: translate(115%, 0);
  -moz-transform: translate(115%, 0);
  -ms-transform: translate(115%, 0);
  -o-transform: translate(115%, 0);
  transform: translate(115%, 0);
}