html {
  height: 100%;
  height: 100vh;
}

body {
  position: relative;
  min-height: 100%;
  min-height: 100vh;

  /* tahoma 不能显示中文双引号 */
  font-family: 'PingFang SC', 'PingFangSC-Regular', 'Microsoft YaHei', 'SimSun',
    'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
}

body.exact-one-page {
  height: 100%;
  height: 100vh;
}

.fixed-top {
  position: fixed;
  top: 0;
}

.fixed-bottom {
  position: fixed;
  bottom: 0;
}

.attached-bottom {
  position: absolute;
  bottom: 0;
}