.cont {
  width: 1000px;
  margin: 0 auto; }

.titsm{
    font-size: 22px;
    font-weight: 600;
    color: #555;
    text-align: center;
}

.video_list {
  width: 1000px;
  margin: 0 auto;
  height: 300px; }
  .video_list .title {
    background: url("../images/title1.png") no-repeat center;
    background-size: cover;
    text-align: center;
    color: #fff;
    font-size: 30px;
    height: 50px;
    line-height: 50px;
    margin-bottom: 50px; }
  .video_list ul {
    width: 100%; }
    .video_list ul li {
      float: left;
      text-align: center;
      width: 49%; }
      .video_list ul li video, .video_list ul li embed {
        width: 100%; }
      .video_list ul li .video_title {
        font-size: 16px;
        color: #434343;
        margin: 5px 0; }
    .video_list ul li:nth-child(2) {
      margin-left: 20px; }