* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

html, body{
  font-size: 24px; 
  font-family: STXihei, "华文细黑", "Microsoft YaHei", "微软雅黑", Helvetica, Tahoma, Arial, sans-serif;
}

.engine {
  margin: auto; 
  width: 21rem;
}

.status {
  margin: 0.5rem auto; 
}
    
.ending {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(238, 228, 217, 0.5);
  z-index: 100;
  text-align: center;
  -webkit-animation: fade-in 800ms ease 800ms;
  animation: fade-in 800ms ease 800ms;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both; 
}
  .ending p {
    font-size: 3rem;
    font-weight: bold;
    margin: 6rem auto 2rem auto; 
    color: #FFFFFF;
  }    
  .ending .btn {
    font-size: 1.2rem;
    font-weight:700;
    margin: 1rem;
  }

.foot{
  margin-top: 0.5rem;
  width: 100%;
}  
  .foot .btn{
    width: 100%;
    font-size: 1.2rem;
  }
  .foot .dropdown-menu{
    width: 100%;
    text-align: center;
    border: 0;
    margin-bottom: 0.2rem;
  }
  .foot li a{
    cursor: pointer;
    font-weight: 700;
    font-size: 1.2rem;
    color: #5bc0de;
  }
  .foot li a:hover{
    color: #5bc0de;
  }

@media screen and (max-width: 320px) {
  html, body {
    font-size: 12px; 
  }
}
@media screen and (min-width: 320px) and (max-width: 480px) {
  html, body {
    font-size: 14px; 
  }
}
@media screen and (min-width: 480px) and (max-width: 640px) {
  html, body {
    font-size: 18px; 
  }
}
@media screen and (min-width: 640px) and (max-width: 768px) {
  html, body {
    font-size: 21px; 
  }
}


@-webkit-keyframes move-up {
  0% {
    top: 1.5rem;
    opacity: 1; 
  }
  100% {
    top: -3rem;
    opacity: 0; 
  } 
}
@keyframes move-up {
  0% {
    top: 1.5rem;
    opacity: 1; 
  }
  100% {
    top: -3rem;
    opacity: 0; 
  } 
}
      

@-webkit-keyframes fade-in {
  0% {
    opacity: 0; 
  }
  100% {
    opacity: 1; 
  } 
}

@keyframes fade-in {
  0% {
    opacity: 0; 
  }
  100% {
    opacity: 1; 
  } 
}

  
@-webkit-keyframes appear {
  0% {
    opacity: 0;
    -webkit-transform: scale(0);
  }
  100% {
    opacity: 1;
    -webkit-transform: scale(1);
  } 
}
@keyframes appear {
  0% {
    opacity: 0;
    transform: scale(0); 
  }
  100% {
    opacity: 1;
    transform: scale(1);
  } 
}

  
@-webkit-keyframes pop {
  0% {
    -webkit-transform: scale(0);
  }
  50% {
    -webkit-transform: scale(1.2);
  }

  100% {
    -webkit-transform: scale(1);
  } 
}
@keyframes pop {
  0% {
    transform: scale(0); 
  }
  50% {
    transform: scale(1.2); 
  }
  100% {
    transform: scale(1); 
  } 
}