.main-contain {
    position: relative;
    /*background: lightblue;*/
    background: url(../img/bg/2.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    width: 100%;
    height: 100vh;
  }
  .main-contain .dock {
    position: absolute;
    bottom: 0px;
    text-align: center;
    display: flex;
    justify-content: center;
    width: 100%;
    left: 0;
  }
  .main-contain span {
    position: absolute;
    left: 0;
    bottom: 0px;
    width: 100%;
    height: 100px;
    display: block;
    opacity: 0.9;
  }
  .main-contain .dock-nav ul {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 300px;
    padding: 20px;
    position: relative;
  }
  .main-contain .dock-nav ul li {
    list-style-type: none;
    display: inline-block;
    padding: 0 10px;
    position: relative;
    transition: all 0.3s linear;
    cursor: pointer;
  }
  .main-contain .dock-nav ul li img {
    width: 50px;
        -webkit-transition: -webkit-transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
      transition: -webkit-transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
      transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
      transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55),-webkit-transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    -webkit-box-reflect: below 8px -webkit-gradient(linear, right top, right
          bottom, from(transparent), to(rgba(255, 255, 255, 0.4)));
  }
  .main-contain .dock-nav ul li:hover img {
    transform: translateY(-15px) scale(1.2);
  }
  .main-contain .dock-nav ul li.other img {
    transform: translateY(-5px);
  }