html{
position: relative;
    min-height: 100%;
}

footer{
    padding: 15px;
position: absolute;
    bottom: 0;
    width: 100%;
}
#sectionPresentation, #sectionContact{
    background-color:#EDEEEF;
}
#sectionLogin, #sectionRegister{
    height: 700px;
    background-color:#EDEEEF;
}