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;
}