.box-sizing {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
.flex {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}
html,
body {
  width: 100%;
  height: 100%;
}
.body_bg {
  position: fixed;
  top: 0;
  left: 0;
  background-color: #f5f9fb;
  height: 100%;
  width: 100%;
  z-index: -1;
}