.fade {
    opacity: 0;
    transition: opacity 0.15s linear;
}
.fade.show {
    opacity: 1;
}
.collapse {
    display: none;
}
.collapse.show {
    display: block;
}
tr.collapse.show {
    display: table-row;
}
tbody.collapse.show {
    display: table-row-group;
}
.collapsing {
    position: relative;
    height: 0;
    overflow: hidden;
    transition: height 0.35s ease;
}