.hidden
{
    display: none;
}
.visually-hidden
{
    position: absolute!important;
    overflow: hidden;
    clip: rect(1px,1px,1px,1px);
    width: 1px;
    height: 1px;
    word-wrap: normal;
}
.visually-hidden.focusable:active, .visually-hidden.focusable:focus
{
    position: static!important;
    overflow: visible;
    clip: auto;
    width: auto;
    height: auto;
}
.invisible
{
    visibility: hidden;
}