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Fluid css fold/unfold animation when having auto height
* Credits goes to +RichBradshaw, from whom I've learned this technique
.container .hidden-container {
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease; /* reverse transition*/
/* remember not to put any borders, paddings here*/
.container:hover .hidden-container {
max-height: 999px; /* enter bigger value if necessary, but don't over do as it impacts the animation speed! */
transition: max-height 0.5s ease; /* forward transition */
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