@media all and (min-width: 560px) {
  .main-content img.align-center {
    width: 90%;
  }
}
article .field--type-image img {
  float:left;
}

.main-content img {
  -webkit-box-shadow: 1px 1px 5px 0px rgba(0,0,0,0.75);
  -moz-box-shadow: 1px 1px 5px 0px rgba(0,0,0,0.75);
  box-shadow: 1px 1px 5px 0px rgba(0,0,0,0.75);
}