Center image <img> inside block

gistfile1.txt

/* doesnt work on ios */
<div class="container">
  <img />
</div>

.container{
    width: 70px;
    height: 70px;
    
    -webkit-display: flex;
    -moz-display: flex;
    -ms-display: flex;
    -o-display: flex;
    display:-webkit-flex;
    display: flex;

    -webkit-align-items: center;
    -moz-align-items: center;
    -ms-align-items: center;
    -o-align-items: center;
    align-items: center;

    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    -o-justify-content: center;
    justify-content: center;
}

.container img{
    max-width: none; /* optional */
    min-width: initial;
    min-height: initial;
    height: auto;
    width: auto;
}