* {
    margin: 0px;
    padding: 0px;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
    cursor: pointer;
}

.clear {
    clear: both;
}

/*AutoCAD Ribbob*/
.ribbon {
    width: 100%;
    height: 200px;
    margin: 10px 0px 0px 0px;
    position: relative;
    top: 100px;
}

.ribbon img {
    width: 100%;
    height: "auto";
    position: absolute;
    box-shadow: 2px 2px 10px #eee;
}

.contents_download {  
    width: 60%;
    height: 60px;
    background: white;
    margin: 10px auto;
    padding: 10px 10px;
    top: 60px;
    position: relative;
    border-radius: 5px;box-shadow:0 2px 10px
}

.contents_download img {
    position: relative;
    margin-left: 20px;
    margin-top: 5px;
    float: left;
    width: 45px;
    height: 45px;
}

.contents_download p {
    /* font-weight: bold; */
    margin-left: 20px;
    float: left;
    height: 50px;
    width: 200px;
    font-size: 20px;
}

.contents_download a {
    font-weight: bold;
    float: left;
    font-size: 20px;
    text-decoration: underline;
    text-underline-offset: 5px;
    /*下划线和文字间距*/
    color: #35B7FF;
    /* border-bottom: 1px solid #35B7FF;
    padding-bottom: 2px; */
}

.contents {
    width: 60%;
    height: auto;
    background: #eee;
    margin: 20px auto;
    padding: 10px 10px;
    top: 0px;
    position: relative;
}

.title {
    margin: 10px 10px;
    position: relative;
}

.tooptip {
    margin: 10px 60px;
    position: relative;
}

.tooptip_img {
    /*上、右、下、左*/
    margin: 10px 10px 10px 60px;
    max-width: 90%;
    position: relative;
}

.tooptip_largeImg {
    /*上、右、下、左*/
    margin: 10px 10px 10px 60px;
    height: auto;
    max-width: 90%;
    width: 90%;
    position: relative;
}

.video-container {
    width: 61%;
     /*上、右、下、左*/
     margin: 80px auto 0px auto;
  }
  
  video {
    width: 100%;
    height: auto;
  }