html {
  height: 100%;
}
body {
  margin: 0;
  display: flex;
  display: -ms-flexbox;
  display: -webkit-flex;
  flex-direction: column;
  -ms-flex-direction: column;
  height: 100%;
}
header {
  -webkit-box-flex: 0;
  -webkit-flex: 0;
  -ms-flex: none;
  flex: none;
}
main {
  -webkit-box-flex: 1;
  -webkit-flex: 1 0 auto;
  -ms-flex: 1 0 auto;
  flex: 1 0 auto;
  flex-basis: auto;
  min-height: 1px;
  position: relative;
}
footer {
  -webkit-box-flex: 0;
  -webkit-flex: 0;
  -ms-flex: none;
  flex: none;
  position: relative;
}