* {
  box-sizing: border-box;
}

html {
  font-family: helvetica;
  font-size: 16px;
}

html,
body {
  margin: 0;
  padding: 0;
}

html,
body{
  height: 100%;
}

#subContainer {
  display: flex;
  min-height: 100%;
}

#mainContainer {
  flex: 1 1 0px;
  margin: .5em;
}