.hide {
    display: none !important;
}
.show {
    display: block !important;
}
.invisible {
    visibility: hidden;
}
.text-hide {
    font: 0/0 a;
    color: transparent;
    text-shadow: none;
    background-color: transparent;
    border: 0;
}
.hidden {
    display: none !important;
}
.affix {
    position: fixed;
}