html{
    display: block;
    margin:0;
    padding:0;
    min-height: 100vh;
}

body{
    display: block;
    margin:0;
    padding:0;
}

main{
    display: block;
    min-height: calc(100vh - 150px);
    width: 100%;
}

footer{
    display: block;
    height: 150px;
    width: 100%;
}

h1{
    display: block;
    margin:0;
    padding:0;
}

footer>strong{
    display: block;
    padding-top: 70px;
    text-align: center;
}