html,
body {
  height: 100%;
}

body {
  max-height: 100%;
  background-image: url('1080.png');
  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: 160px;
  margin-left: calc(15vw + 67px);
  margin-top: 20vh;
  margin-bottom: auto;
}

.centered-div {
  position: absolute;
  width: 314px;
  top: calc(20vh + 180px);
  left: 15vw;
}

.centered-div a {
  display: inline-block;
  height: 43px;
}

.top-left, .top-right {
  position: absolute;
  top: 0;
  width: 151px;
  height: 43px;

}

.top-left {
  left: 0;
}

.top-right {
  right: 0;
}

.bottom-center {
  width: 210px;
  height: 60px;
}

.centered-div--top {
}

.centered-div--bottom {
}

/* 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.png');
  }
  .mycontainer {
    align-items: center;
  }
  .logo {
    width: 140px;
    margin-left: 0;
    margin-top: 5vh;
  }
  .centered-div {
    left: auto;
    top: calc(5vh + 170px);
  }
  .centered-div--bottom {
    text-align: center;
  }
}