html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  color: #333;
  font-size: 17px;
  font-family: -apple-system, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Microsoft YaHei, Source Han Sans SC, Noto Sans CJK SC, WenQuanYi Micro Hei, sans-serif;
  background-color: #fff;
  overscroll-behavior-y: none;
  -webkit-overflow-scrolling: touch;
}

body {
  max-width: 720px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page {
  padding: 20px;
  text-align: center;
}

.head > .logo {
  font-size: 32px;
  font-weight: bold;
}

.head > .logo::before {
  content: '🥳';
  font-size: 22px;
  margin-right: 5px;
  animation: jumps 1.5s ease-in-out 1;
  display: inline-block;
}

.head > .desc {
  margin: 8px 0;
}

.des {
  margin: 15px 0 5px;
}

.app > a {
  margin-right: 10px;
}

.app > a:nth-last-child(1) {
  margin-right: 0;
}

.explain {
  text-align: left;
  margin-top: 40px;
}

.footer {
  margin-top: 10px;
}

a {
  color: #4786c5;
  font-weight: bold;
  text-decoration: underline;
}

.btn {
  display: inline-block;
  cursor: pointer;
  background-color: #0dc140;
  color: #fff;
  font-weight: bold;
  border: 1px solid #0d9c35;
  padding: 10px 20px;
  text-decoration: none;
  text-align: center;
  border-radius: 4px;
  transition: 0.25s;
}

.btn:hover {
  padding: 10px 40px;
  background-color: #0d9c35;
}

.des2 {
  margin: 15px 0;
  font-weight: bold;
  word-break: break-all;
}

@keyframes jumps {
  0% {
      transform: translate(0);
  }

  10% {
      transform: translateY(8px) scaleX(1.2) scaleY(0.8);
  }

  30% {
      transform: translateY(-5px) scaleX(1) scaleY(1) rotate(5deg);
  }

  50% {
      transform: translateY(3px) scale(1) rotate(0);
  }

  55% {
      transform: translateY(0) scaleX(1.1) scaleY(0.9) rotate(0);
  }

  70% {
      transform: translateY(-5px) scaleX(1) scaleY(1) rotate(-2deg);
  }

  80% {
      transform: translateY(0) scaleX(1) scaleY(1) rotate(0);
  }

  85% {
      transform: translateY(0) scaleX(1.05) scaleY(0.95) rotate(0);
  }

  to {
      transform: translateY(0) scaleX(1) scaleY(1);
  }
}

@media screen and (max-width:640px) {
  html,
  body {
    font-size: 19px;
  }
}