.radiobtn {
  position: relative;
  display: block;
}
.radiobtn label {
  display: block;
  background: #8b91a6;
  color: #fff;
  border-radius: 5px;
  padding: 5px 20px;
  border: 2px solid #17234e;
  margin-bottom: 5px;
  cursor: pointer;
  height: 44px;
}
.radiobtn label:after, .radiobtn label:before {
  content: "";
  position: absolute;
  right: 11px;
  top: 11px;
  width: 20px;
  height: 20px;
  border-radius: 3px;
  background: #17234e;
}
.radiobtn label:before {
  background: transparent;
  transition: 0.1s width cubic-bezier(0.075, 0.82, 0.165, 1) 0s, 0.3s height cubic-bezier(0.075, 0.82, 0.165, 2) 0.1s;
  z-index: 2;
  overflow: hidden;
  background-repeat: no-repeat;
  background-size: 13px;
  background-position: center;
  width: 0;
  height: 0;
  background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxNS4zIDEzLjIiPiAgPHBhdGggZmlsbD0iI2ZmZiIgZD0iTTE0LjcuOGwtLjQtLjRhMS43IDEuNyAwIDAgMC0yLjMuMUw1LjIgOC4yIDMgNi40YTEuNyAxLjcgMCAwIDAtMi4zLjFMLjQgN2ExLjcgMS43IDAgMCAwIC4xIDIuM2wzLjggMy41YTEuNyAxLjcgMCAwIDAgMi40LS4xTDE1IDMuMWExLjcgMS43IDAgMCAwLS4yLTIuM3oiIGRhdGEtbmFtZT0iUGZhZCA0Ii8+PC9zdmc+);
}
.radiobtn input[type=radio] {
  display: none;
  position: absolute;
  width: 100%;
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
}
.radiobtn input[type=radio]:checked + label {
  background: #17234e;
  -webkit-animation-name: blink;
          animation-name: blink;
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  border-color: #8b91a6;
}
.radiobtn input[type=radio]:checked + label:after {
  background: #8b91a6;
}
.radiobtn input[type=radio]:checked + label:before {
  width: 20px;
  height: 20px;
}

@-webkit-keyframes blink {
  0% {
    background-color: #17234e;
  }
  10% {
    background-color: #17234e;
  }
  11% {
    background-color: #17234e;
  }
  29% {
    background-color: #17234e;
  }
  30% {
    background-color: #17234e;
  }
  50% {
    background-color: #17234e;
  }
  45% {
    background-color: #17234e;
  }
  50% {
    background-color: #17234e;
  }
  100% {
    background-color: #17234e;
  }
}

@keyframes blink {
  0% {
    background-color: #17234e;
  }
  10% {
    background-color: #17234e;
  }
  11% {
    background-color: #17234e;
  }
  29% {
    background-color: #17234e;
  }
  30% {
    background-color: #17234e;
  }
  50% {
    background-color: #17234e;
  }
  45% {
    background-color: #17234e;
  }
  50% {
    background-color: #17234e;
  }
  100% {
    background-color: #17234e;
  }
}