main.css
html, body {
width:100%;
min-height:100%;
padding:0;
margin:0;
}
body {
display: flex;
flex-direction:column;
}
header {
padding:8px;
background: hsl(50, 100%, 50%);
min-height: 40px;
}
footer {
background: hsl(135, 100%, 50%);
min-height: 100px;
}
main {
flex: 1;
background: hsl(215, 20%, 90%);
}