* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  position: relative;
  width: 100%;
  height: 100%;
  background-color: #2196f3;
}

.page {
  height: 100%;
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -moz-box-align: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -moz-box-pack: center;
  -ms-flex-pack: center;
}

.folder {
  background-color: #d3eafd;
  position: relative;
  width: 92px;
  height: 64px;
  display: block;
  border-top-right-radius: 8px;
  border-bottom-right-radius: 8px;
  border-bottom-left-radius: 8px;
}

.folder-tab {
  position: absolute;
  height: 10px;
  left: 0;
  bottom: 100%;
  display: block;
  width: 40%;
  border-top-left-radius: 8px;
  background-color: inherit;
}
.folder-tab:after {
  content: '';
  position: absolute;
  display: block;
  top: 0;
  left: calc(100% - 10px);
  border-bottom: 10px solid #d3eafd;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
}

.folder-icn {
  padding-top: 12px;
  width: 100%;
  height: 100%;
  display: block;
}

.downloading {
  width: 30px;
  height: 32px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.custom-arrow {
  width: 14px;
  height: 14px;
  position: absolute;
  top: 0;
  left: 50%;
  margin-left: -7px;
  background-color: #fff;
  -webkit-animation-name: downloading;
  -webkit-animation-duration: 1.5s;
  -webkit-animation-iteration-count: infinite;
  animation-name: downloading;
  animation-duration: 1.5s;
  animation-iteration-count: infinite;
}
.custom-arrow:after {
  content: '';
  position: absolute;
  display: block;
  top: 100%;
  left: -9px;
  border-top: 15px solid #fff;
  border-left: 16px solid transparent;
  border-right: 16px solid transparent;
}

.bar {
  width: 30px;
  height: 4px;
  background-color: #fff;
  margin: 0 auto;
}

@-webkit-keyframes downloading {
  0% {
    top: 0;
    opacity: 1;
  }
  50% {
    top: 110%;
    opacity: 0;
  }
  52% {
    top: -110%;
    opacity: 0;
  }
  100% {
    top: 0;
    opacity: 1;
  }
}
@keyframes downloading {
  0% {
    top: 0;
    opacity: 1;
  }
  50% {
    top: 110%;
    opacity: 0;
  }
  52% {
    top: -110%;
    opacity: 0;
  }
  100% {
    top: 0;
    opacity: 1;
  }
}