*{
    margin: 0;
    padding: 0;
    border: none;
    box-sizing: border-box;
}

a{
    color: inherit;
    text-decoration: none;
}

body{
    width: 100%;
    min-width: 1200px;
}

.fl{
    float: left;
}

.fr{
    float: right;
}

.hide{
    display: none;
}
.ebook{
    display: flex;
    flex-wrap: wrap;
    width: 600px;
    margin: 0 auto;
}
.ebook_cover{

}
.ebook_cover img{
    width: 150px;
}
.cbook_text{
}
.ebook_but{
  
    margin-left:20%;
    font-size: 14px;
    width: 90px;
}
.ebook_Introduction{
    font-size: 1.2em;
    margin-top: -80px;
    margin-left: 170px;
}
.nav .itm a{
    color: #356cb7;
}