This is a very wrong approach

`    .preheader {
      color: transparent;
      display: none;
      height: 0;
      max-height: 0;
      max-width: 0;
      opacity: 0;
      overflow: hidden;
      mso-hide: all;
      visibility: hidden;
      width: 0;
    }`

this, or the fact that it's all wrapped in an old _td_, _tr_ table.

`font-size: 16px;`

This is so wrong

Please! Don't use this