div {
    height: 10em;
    background-color: #FFF;
    position: relative;
  }
  div img{
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      -webkit-transform: translate(-50%, -50%);
  }

  #main-logo{
    width:100px;
  }