[Solved] HTML CSS image responsive website

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You could make use of css calc() function to set top positioning of element as below.

.imagess {
   position: relative;
   width: 100%;
   height:800px;
   overflow:hidden;
   background:#111;
}
.imagess > img{
  position:absolute;
  width:200px;
  height:300px;
  right:0;
  top:calc(100% - 90%);
}
<div class="imagess">
  <img src="https://source.unsplash.com/random">
</div>

solved HTML CSS image responsive website