.header {

  padding: 40px;

  text-align: center;

  background: #18a388;

  color: white;

  font-size: 20px;

}



.logo {

    margin-left:75px;

}


@media screen and (max-width: 600px) {

  .header a {

    float: none;

    display: block;

    text-align: left;

  }

  .logo

  {

      width:100%;

      margin-left:0px;

  }

  .txt

  {

      width:100%;

      font-size:12px;

  }

  

    

}