<div>
width: auto (original picture width but not containing block width)
  <img src="https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png">

  width: 300px
    <img width="300px" src="https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png">
  
  width: 50px
<img width="50px" src="https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png">
</div>
body{
  background-color: rgb(30,30,30);
  color: white;
  font-family: verdana;
}

div{
  width: 400px;
}

img{
  display: block;
  margin-top: 10px;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.