Edit in JSFiddle

<img src="http://78.46.145.62/tutorials/wp-content/uploads/2016/07/panda.jpg"
alt="панда на дереве" style="width:299px;height:199px;">
<img src="http://78.46.145.62/tutorials/wp-content/uploads/2016/07/panda.jpg"
alt="панда на дереве" width="299" height="199">
img { 
    width:100%; 
}