html,body {
 width: 100%;
 height: 100%;
  padding:0;
  margin:0;
}

.container {
  width: 100%;
  height: 100%;
  background: #FFF;
  min-height: 250px;
  position: relative;
}

img {
  max-height: 100%;
  max-width: 100%;
  height: auto;
  width: auto;
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  box-sizing: border-box;
  margin: auto;
}