body {
  margin: 0;
  height: 100vh;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
  font-size: 14px;
}

.background {
  position: relative;
  background: linear-gradient(to top, #49b26e 0%, #57d895 100%);
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  box-shadow: 0 5px 15px 0 rgba(0, 0, 0, 0.25);
  width: 400px;
  height: 400px;
  color: white;
}
.background input {
  display: none;
}
.background .button {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 260px;
  height: 60px;
  border: 2px solid white;
  border-radius: 30px;
  text-align: center;
  font-size: 20px;
  text-transform: uppercase;
  font-weight: bold;
  letter-spacing: 2px;
  transition: all 0.3s ease-in-out;
  cursor: pointer;
}
.background .button:hover {
  background-color: #37be77;
}
.background .button .fas {
  position: absolute;
  color: #4caf50;
  z-index: 2;
  opacity: 0;
}
.background .circle {
  position: absolute;
  width: 65px;
  height: 65px;
  fill: none;
  stroke: white;
  stroke-width: 2px;
  stroke-linecap: round;
  stroke-dasharray: 183 183;
  stroke-dashoffset: 183;
  opacity: 0;
  left: 0;
  bottom: 0;
  right: 0;
  top: 0;
  margin: auto;
  pointer-events: none;
  transform: rotate(-90deg);
}
.background input:checked ~ .button {
  animation: button 0.5s ease both, fill 0.5s ease-out 1.5s forwards;
}
.background input:checked ~ .button .fas {
  animation: check 0.5s ease-out 1.5s both;
}
.background input:checked ~ .circle {
  animation: circle 2s ease-out 0.5s both;
}

@keyframes button {
  0% {
    width: 260px;
    left: 70px;
    border-color: white;
    color: white;
  }
  50% {
    color: transparent;
  }
  100% {
    width: 60px;
    left: 170px;
    border-color: #45b078;
    background: transparent;
    color: transparent;
  }
}
@keyframes circle {
  0% {
    stroke-dashoffset: 183;
  }
  50% {
    stroke-dashoffset: 0;
    stroke-dasharray: 183;
    transform: rotate(-90deg) scale(1);
    opacity: 1;
  }
  90%,
  100% {
    stroke-dasharray: 500 500;
    transform: rotate(-90deg) scale(2);
    opacity: 0;
  }
}
@keyframes fill {
  0% {
    background: transparent;
    border-color: white;
  }
  100% {
    background: white;
  }
}
@keyframes check {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}