#A_html{
    width: 900px;
    margin: auto;
    min-height: 550px
}

.intro{
    float: right;
    width: 600px;
    margin: 100px auto;
    /* min-height: 250px; */
    font-weight: 200;
    font: 16px sans-serif;
}
#A_img_left{
    float: left;
    width: 250px;
    margin-top:100px; 
}
#A_link a{
    display: inline-block;
}