body {
  background-color: rgb(255, 255, 255);
  font-size: 1em;
}

.imageheader {
  display: block;
  float: left;
  width: 500px;
  height: auto;
  margin-left: 5%;
  overflow: hidden;
}

.imagemap {
  display: block;
  float: left;
  clear: both;
  width: 90%;
  height: auto;
  margin-left: 5%;
  overflow: hidden;
}

@media(max-width: 768px) {
  .imageheader {
    width: 400px;
    height: auto;
    margin-left: 4.99878%;
  }

  .imagemap {
    height: auto;
    margin-left: 4.99878%;
  }
}

@media(max-width: 480px) {
  body {
    font-size: 1em;
  }

  .imageheader {
    width: 250px;
    height: auto;
    margin-left: 5%;
  }

  .imagemap {
    height: auto;
    margin-left: 5%;
  }
}