html - How do I remove the grey background around my picture? -


how remove grey background around picture? here's how page looks right now: http://imgur.com/w52pfhn

.header {    text-align: center;    font-size: 50px;    font-family: sans-serif;    font-style: bold;    color: white;    background-color: white;    background-image: url("https://dummyimage.com/vga");    padding: 10%;    margin: 0%;    border: 0%;  }    body {    background-color: grey;  }
<div class="header">    <h1>hello</h1>  </div>

by default body has margin, so:

body {     margin: 0; }

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