html,
body {
  height: 100%;
}

body {
  max-height: 100%;
  background-image: url('1080.jpg');
  background-size: 100% 100%;
  background-repeat: no-repeat;
}

main {
  height: 100%;
}

.mycontainer {
  display: flex;
  align-items: start;
  flex-direction: column;
  height: 100%;
  margin: 0 auto;
  width: 100%;
}

.logo {
  height: auto;
  width: 314px;
  margin-left: 100px;
  margin-top: auto;
  margin-bottom: calc(30vh + 120px);
}

.centered-div {
  position: absolute;
  width: 314px;
  height: 120px;
  bottom: 30vh;
  left: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  /* transform: scale(0.4); */
}

.top-left, .top-right {
  position: absolute;
  top: 0;
  width: 155px;
  height: 50px;

}

.top-left {
  left: 0;
}

.top-right {
  right: 0;
}

.bottom-center {
  align-self: center;
  width: 210px;
  height: 50px;
}

.download-overlay {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: block;
  background: rgba(255, 255, 255, 0.15);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  z-index: 9999;
}

.download-overlay.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.progress-shell {
  width: 140px;
  height: 140px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
}

.progress-ring {
  width: 140px;
  height: 140px;
  transform: rotate(-90deg);
  -webkit-transform: rotate(-90deg);
  display: block;
}

.progress-ring__bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.35);
  stroke-width: 10;
}

.progress-ring__value {
  fill: none;
  stroke: #ffffff;
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.12s linear, stroke 0.2s ease;
}

.progress-percent {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: block;
  text-align: center;
  line-height: 140px;
  font-size: 28px;
  font-weight: 600;
  color: #ffffff;
  transition: opacity 0.2s ease;
}

.progress-check {
  position: absolute;
  top: 50%;
  left: 50%;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.6);
  -webkit-transform: translate(-50%, -50%) scale(0.6);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.download-overlay.is-complete .progress-percent {
  opacity: 0;
}

.download-overlay.is-complete .progress-ring__value {
  stroke: #7ce38b;
}

.download-overlay.is-complete .progress-check {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  -webkit-transform: translate(-50%, -50%) scale(1);
  animation: pop 0.6s ease;
}

@keyframes pop {
  0% {
    transform: translate(-50%, -50%) scale(0.6);
    -webkit-transform: translate(-50%, -50%) scale(0.6);
  }
  60% {
    transform: translate(-50%, -50%) scale(1.08);
    -webkit-transform: translate(-50%, -50%) scale(1.08);
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
    -webkit-transform: translate(-50%, -50%) scale(1);
  }
}

@supports ((-webkit-backdrop-filter: blur(6px)) or (backdrop-filter: blur(6px))) {
  .download-overlay {
    background: rgba(255, 255, 255, 0.1);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
  }
}

/* 移动端样式，放在全局作用域，兼容所有浏览器 */
@media (max-width: 600px) {
  body {
    background-image: url('bg.jpg');
  }
  .mycontainer {
    align-items: center;
  }
  .logo {
    height: 20vh;
    margin-left: 0;
    margin-top: 3vh;
    width: auto;
  }
  .centered-div {
    bottom: auto;
    top: 25vh;
    left: auto;
  }
}