.show {
    visibility: visible;
    -webkit-transition: visibility 1s linear;
    -moz-transition: visibility 1s linear;
    -o-transition: visibility 1s linear;
    transition: visibility 1s linear;
}

.hide {
    visibility: hidden;
    -webkit-transition: visibility 1s linear;
    -moz-transition: visibility 1s linear;
    -o-transition: visibility 1s linear;
    transition: visibility 1s linear;
}