@import url(https://fonts.googleapis.com/css?family=Open+Sans:400|Raleway:300);

@media (min-width: 600px) {
  .wrap {
    width: 50%;
    float: left;
  }
}
[class^=btn-] {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  height: 40px;
  max-width: 150px;
  margin: 1rem auto;
  text-transform: uppercase;
  border: 1px solid currentColor;
}
.btn-10 {
  color: #ffffff;
}
.btn-10:before, .btn-10:after,
.btn-10 span:before,
.btn-10 span:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.25);
  transition: 0.4s;
}
.btn-10:after,
.btn-10 span:before {
  left: auto;
  right: 0;
}
.btn-10 span:before,
.btn-10 span:after {
  transition-delay: 0.4s;
}
.btn-10:hover {
  color: white;
}
.btn-10:hover:before, .btn-10:hover:after,
.btn-10:hover span:before,
.btn-10:hover span:after {
  width: 150px;
}
.btn-10:active {
  background-color: rgba(255, 255, 255, 0.25);
}

@-webkit-keyframes criss-cross-left {
  0% {
    left: -20px;
  }
  50% {
    left: 50%;
    width: 20px;
    height: 20px;
  }
  100% {
    left: 50%;
    width: 375px;
    height: 375px;
  }
}

@keyframes criss-cross-left {
  0% {
    left: -20px;
  }
  50% {
    left: 50%;
    width: 20px;
    height: 20px;
  }
  100% {
    left: 50%;
    width: 375px;
    height: 375px;
  }
}
@-webkit-keyframes criss-cross-right {
  0% {
    right: -20px;
  }
  50% {
    right: 50%;
    width: 20px;
    height: 20px;
  }
  100% {
    right: 50%;
    width: 375px;
    height: 375px;
  }
}
@keyframes criss-cross-right {
  0% {
    right: -20px;
  }
  50% {
    right: 50%;
    width: 20px;
    height: 20px;
  }
  100% {
    right: 50%;
    width: 375px;
    height: 375px;
  }
}
.btn-10 {
    text-decoration: none;
    line-height: 40px;
    display: flex;
    flex-direction: row;
    justify-content: center;
}