html, body {
  overflow-x: hidden;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow-y: scroll;
  margin: 0 auto;
  max-width: 500px;
  background-color: #FAFAFA;
}

a:link {
  text-decoration: none;
  color: white;
}

a:active {
  text-decoration: none;
}

a:hover {
  text-decoration: none;
  color: white;
}

a:visited {
  text-decoration: none;
  color: white;
}

p {
  margin: 0;
}

.container {
  width: 100%;
  height: 100vh;
  overflow-y: scroll;
  position: relative;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/*顶部*/
.header-wrapper {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 97.3%;
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.main-header {
  position: absolute;
  width: 100%;
  height: 100%;
  min-height: 310px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-bottom: 115px;
  box-sizing: border-box;
  background: url('../assets/bg-header.png') 100% 100%/cover no-repeat;
}
.description-wrapper {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 30px 0;
}
.app-name {
  font-size: 21px;
  color: white;
  font-weight: bold;
  line-height: 30px;
  height: 30px;
}

.version {
  margin-top: 6px;
  font-size: 11px;
  color: white;
  line-height: 15px;
  height: 15px;
}

/*图片*/
.logo {
  	position: relative;
    width: 50%;
    height: 100px;
    margin: 0 25% 0 25%;
    background: url(../images/logo.png) center center/contain no-repeat;
}

.subtitle {
  position: relative;
  width: 257px;
  height: 42px;
  margin: 2px auto 0 auto;
  background: url('../assets/subtitle.png') center center/contain no-repeat;
}

.f16 {font-size: 16px;}
.f14 {font-size: 14px;}

.text-white {color: white;}
.text-black {color: #333333;}

.bold {font-weight: bold;}

/* mask */
.mask {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
}

.mask-arrow {
  height: 179px;
  box-sizing: border-box;
  margin: 26px 26px 0 0;
  background: url('../assets/arrow.png') right center/contain no-repeat;
}

.mask-text {
  width: 230px;
  height: 65px;
  border-radius: 10px;
  display: flex;
  margin-top: 25px;
  justify-content: center;
  align-items: center;
  align-self: center;
  color: #333333;
  font-size: 20px;
  background-color: rgba(255, 255, 255, 0.8);
}