.mouse_drag{
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.trans-up {
    transform: translateY(50px);
}

.trans-down {
    transform: translateY(-50px);
}

.trans-no {
    transform: translateY(0);
}