Make image fill div completely without stretching

Question

I have large images of varying dimensions that need to completely fill 240px by 300px containers in both dimensions. Here is what I got right now, which only works for one d

Answer 1

Here is another solution I found, that no need to seperate portraid or landscape or scripting.

CSS

.container{
  position: relative;
  width: 500px;
  height: 300px;
  margin-top: 30px;
  background: #4477bb;
}
.pic{
    max-width: 100%;
    width: auto;
    max-height: 100%;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
}

Here it is, it works well...

https://jsfiddle.net/efirat/17bopn2q/2/