javascript - How to set height div css for 16:9 aspect ratio in portrait mode for Ionic 2 -


suppose have div on top of ion-content. i'm trying set height of div getting width of device , calculate aspect ratio 16:9 youtube app. however, have no idea how achieve using css. now, have. 

div {     width: auto;     max-height: 40%; <-- how set height 16:9      background: black;  div.img {     width: 360px;     max-height: 202.5px; }

enter image description here

what wanted:

enter image description here

you need use simple css style

56.25% = 16:9 aspect ratio

.img {     width: 100%;     height: 56.25vw; }

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