*,
*:before,
*:after {
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width:100%;
    height:100%;
}

body {
    width: 100%;
    min-height: 100%;
    font-family: 'Calibri', 'Gill Sans MT', Arial, Helvetica, sans-serif;
    font-size: 16px;
    color:#FFF;
    background: rgba(0, 0, 0, .1);
    background-image: url('./../images/background-aurora.jpg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    display:flex;
    align-items: center;
    justify-content: center;
}

main {
    display:flex;
    align-items: center;
    justify-content: center;
    width:100%;
    min-height:100%;
    margin:0 auto;
}