body {
  background: white;
}

.intro {
  position: relative;
  margin: 70px auto;
  font-family: "Microsoft YaHei",'Lato', sans-serif;
  color: #458ecc;
  width: 600px;
}

button {
  position: relative;
  display: block;
  margin: 125px auto;
  line-height: 65px;
  text-decoration: none;
  text-align: center;
  font-size: 28px;
  font-family: 'Lato', sans-serif;
  font-weight: bold;
  text-shadow: 2px 2px 2px #3a7faa;
  box-shadow: 0px 9px 0px #3a7faa, 0px 9px 25px rgba(0, 0, 0, 0.7);
  transition: all .1s ease;
  -webkit-transition: all .1s ease;
  color: white;
  background-color: #458ecc;
  border-radius: 8px;
  border: none;
  outline: 0 none;
  width: 250px;
  height: 80px;
  overflow: hidden;
  cursor: pointer;
}

button:active {
  box-shadow: 0px 3px 0px #3a7faa, 0px 3px 6px rgba(0, 0, 0, 0.9);
  top: 6px;
}

.main-text {
  position: absolute;
  left: 110px;
}

.submit {
  text-transform: uppercase;
  color: #efd959;
}

.sent-text {
  position: absolute;
  left: 40px;
  opacity: 0;
}

button.active .main-text {
  display: none;
}

button.active .sent-text {
  animation: sent 4s forwards;
  animation-delay: 4s;
  -webkit-animation: sent 4s forwards;
  -webkit-animation-delay: 4s;
}

.sub {
  float: left;
  padding: 0 0 0 10px;
  width: 65px;
  height: 65px;
}

button.active .sub {
  animation: drive 3s forwards;
  animation-delay: 2s;
  -webkit-animation: drive 3s forwards;
  -webkit-animation-delay: 2s;
}

.splash {
  float: left;
  margin-left: 30px;
  margin-top: -40px;
  transform: rotate(-10deg);
  -webkit-transform: rotate(-10deg);
  opacity: 0;
}

.splash-2 {
  float: right;
  margin-right: 30px;
  transform: rotate(10deg);
  -webkit-transform: rotate(10deg);
}

.submerge {
  position: absolute;
  top: 80px;
  border-radius: 0 0 10px 10px;
  left: 0;
  opacity: .7;
}

button.active .submerge {
  animation: submerge 2s forwards;
  -webkit-animation: submerge 2s forwards;
}

.return {
  position: relative;
  display: block;
  margin: auto;
  font-family: 'Lato', sans-serif;
  font-size: 22px;
  text-align: center;
  border: 2px solid #8ec6ef;
  padding: 0 15px;
  text-decoration: none;
  line-height: 40px;
  color: #8ec6ef;
  width: 150px;
  height: 40px;
}

.return:hover {
  color: #458ecc;
  border: 2px solid #458ecc;
}

@keyframes submerge {
  to {
    transform: translateY(-50px);
  }
}
@keyframes drive {
  to {
    transform: translateX(140px);
  }
}
@keyframes sent {
  to {
    opacity: 1;
  }
}
@-webkit-keyframes submerge {
  to {
    -webkit-transform: translateY(-50px);
  }
}
@-webkit-keyframes drive {
  to {
    -webkit-transform: translateX(140px);
  }
}
@-webkit-keyframes sent {
  to {
    opacity: 1;
  }
}
@keyframes jump {
  25% {
    transform: translateY(-90px) rotate(-40deg);
  }

  75% {
    transform: translateY(-90px) translateX(150px) rotate(40deg);
  }

  100% {
    transform: translateY(0) translateX(150px);
  }
}
@keyframes water-splash {
  0% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}
@-webkit-keyframes jump {
  25% {
    -webkit-transform: translateY(-90px) rotate(-40deg);
  }

  75% {
    -webkit-transform: translateY(-90px) translateX(150px) rotate(40deg);
  }

  100% {
    -webkit-transform: translateY(0) translateX(150px);
  }
}
@-webkit-keyframes water-splash {
  0% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}
@media (min-width: 800px) {
  button {
    overflow: visible;
  }

  .submerge {
    display: none;
  }

  button.active .sub {
    animation: jump 4s forwards;
  }

  button.active .splash {
    animation: water-splash 3s forwards;
  }

  button.active .splash-2 {
    animation-delay: 3s;
  }

  button.active .sub {
    -webkit-animation: jump 4s forwards;
  }

  button.active .splash {
    -webkit-animation: water-splash 3s forwards;
  }

  button.active .splash-2 {
    -webkit-animation-delay: 3s;
  }
}