* {
  box-sizing: border-box;
}

html {
  margin: 0;
  padding: 0;
  height:100%;
}

body {
  margin: 0;
  padding: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position:relative;
  background-color:black;
}

#main {
  position: relative;
  flex: 1 1 auto;
  align-self: stretch;
}

#header
{
  position: static;
  padding: 10px 10px;
}

#footer
{
  position: static;
  padding: 6px 10px;
}