div#howtouse{
display: block;
width: 650px;
margin:0 auto;
height:300px;
background-image: url(http://d-park.jp/pic-labo/howto0.jpg);
background-repeat: no-repeat;
border:solid 1px;
}
div#howtouse div{
margin-top:3px;
width:350px;
padding-left:300px;
}