CSS/HTML zu: Pdf Dokument via iFrame im Blog einbinden

<style>
.grid {
           display: block;
           float: left;
           padding: 10px 0;
}
label span{
        font-size: 26px !important;
        font-family: serif !important;
        color: #ad3a2b;
}
label span:hover {
        color: red;
}
.layer {
        width: 100%;
        height: 100%;
        position: absolute;
        top: 0;
        left: 0;
        display: none;
        z-index: 999;
        background: rgb(0,0,0);
        background: rgba(0,0,0,0.7);
}
.layer label {        
        display: table-cell;
        vertical-align: middle;
        text-align: center;
}
input:checked ~ .layer {
        display: table;
}
input:checked ~ .layer label:before {
        content:url("http://goo.gl/v968O");
        position: absolute;
        right: 5px;
        top: 5px;
}
#zu, input { display: none; }
</style>
<div style="display: table; margin: 0 auto;">
        <div class="gird">
                <label for="box1"><span style="">Erlkönig .pdf »</span></label>
                                  <input id="box1" name="gallery" type="radio" />
                                        <div class="layer">
                                                <label for="zu" title=""><iframe height="850px" src="https://docs.google.com/document/pub?id=11VUOhjvRY2td9A16KvsiUJOZu3Nq7yFormvw02_GQ4Y&amp;embedded=true" width="600px"></iframe></label>
                                   </div>
        </div>
        <div class="grid">
                <label for="box2"><span style="">Zauberlehrling .pdf »</span></label>
                          <input id="box2" name="gallery" type="radio" />
                                <div class="layer">
                                        <label for="zu" title=""><iframe height="850px" src="https://docs.google.com/document/pub?id=1JlaVJBIx628Hwh57VfyxyCa-JKep6q0_AdEO76fdm4k&amp;embedded=true" width="600px"></iframe></label></div>
                                </div>
        </div>
<input id="zu" name="gallery" type="radio" />