.invisible {
        visibility:hidden;
}
.opacity-0 {
    opacity: 0;
}


.transition-opacity {
   -webkit-transition-property: opacity;
    transition-property: opacity;
    -webkit-transition-timing-function: cubic-bezier(.4,0,.2,1);
    transition-timing-function: cubic-bezier(.4,0,.2,1);
    -webkit-transition-duration: .15s;
    transition-duration: .15s;  
}