#container{
    width:100%;
    max-width:1280px;
    margin:0 auto;
    padding:0 20px;
    box-sizing:border-box;
}
html,
body {
    height: 100%;
    margin: 0;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}