SOURCE

<h1>试用网页</h1>
<img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1523458490793&di=b0922ccd89bce8e48939773c48c3d6db&imgtype=0&src=http%3A%2F%2Fa.hiphotos.baidu.com%2Fbaike%2Fc0%253Dbaike60%252C5%252C5%252C60%252C20%2Fsign%3D71aea724c2cec3fd9f33af27b7e1bf5a%2F54fbb2fb43166d2287f64f7c472309f79152d251.jpg" alt="My test image">
<p>At Mozilla, we’re a global community of</p>
    
<ul> 
  <li>technologists</li>
  <li>thinkers</li>
  <li>builders</li>
</ul>

<p>working together ... </p>

html{
  background-color:#00539f;
  font-size:10px;
}
h1{
  margin:0;
  padding:20px 0px; 
  text-align:center;
  text-shadow:1px 1px 2px red;
  color:#00539f;
}
body{
  background-color:#ff9500;
  padding:0px 20px 20px 20px;
  margin:10px;
  border: 6px solid black;
  width:600px;
}
img{
  display:block;
  margin:0 auto;
}