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css代码段

#mcover {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    z-index: 20000;
 }
 #mcover img {
    position: fixed;
    right: 18px;
    top: 5px;
    width: 260px!important;
    height: 180px!important;
    z-index: 20001;
 }
 .text {
    margin: 15px 0;
    font-size: 14px;
    word-wrap: break-word;
    color: #727272;
 }
 #mess_share {
    margin: 15px 0;
    display: block;
 }
 #share_1 {
    float: left;
    width: 49%;
    display: block;
 }
 #share_2 {
    float: right;
    width: 49%;
    display: block;
 }
 .clr {
    display: block;
    clear: both;
    height: 0;
    overflow: hidden;
 }
 .button2 {
    font-size: 16px;
    padding: 8px 0;
    border: 1px solid #adadab;
    color: #000000;
    background-color: #e8e8e8;
    background-image: linear-gradient(to top, #dbdbdb, #f4f4f4);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.45), inset 0 1px 1px #efefef;
    text-shadow: 0.5px 0.5px 1px #fff;
    text-align: center;
    border-radius: 3px;
    width: 100%;
 }
 #mess_share img {
    width: 22px!important;
    height: 22px!important;
    vertical-align: top;
    border: 0;
 }
 /**********************audio***********************/
 .btn_music{
    display:inline-block;
    width:35px;
    height:35px;
    background:url('../../img/play.png') no-repeat center center;
    background-size:100% auto;
    position:absolute;
    z-index:100;
    left:15px;
    top:20px;
 }
 .btn_music.on{
    background-image:url('../../img/stop.png');
 }
 /******************************动画*************************/
 #iframe_screen{
    background:#fff;
    position:absolute;
    width:100%;
    height:100%;
    left:0;
    top:0;
    z-index:300000;
    overflow:hidden;
 }

html段：

 <div id="mcover" onclick="document.getElementById('mcover').style.display='';" style="display:none;">
                    <img src="SELF_PUBLIC/Img/guide.png" />
                </div>
   <div class="text" id="content">
                    <div id="mess_share">
                        <div id="share_1">
                            <button class="button2" onclick="document.getElementById('mcover').style.display='block';">
                                <img src="SELF_PUBLIC/Img/icon_msg.png" width="64" height="64" />
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                            </button>
                        </div>
                        <div id="share_2">
                            <button class="button2" onclick="document.getElementById('mcover').style.display='block';">
                                <img src="SELF_PUBLIC/Img/icon_timeline.png" width="64" height="64" />
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                            </button>
                        </div>
                        <div class="clr"></div>
                    </div>
                </div>

效果图：