It says I haven't set the max-width yet on the image and I don't know what I'm doing wrong?

a {
  text-decoration: none;
}

body {
  font-family: 'Open Sans' , ' sans-serif;
}

#wrapper {
  max-width: 940px;
  margin: 0 auto;
  padding: 0.5%;
}

#logo {
  text-align: center;
  margin: 0;
}

#gallery{
  max-width: 100%;
}

#img {
  max-width: 100%;
}

h1, h2 {
  color: #fff;
}

nav a {
  color: #fff;
}

nav a:hover {
  color: #32673f;
}

h1 {
  font-family: ‘Changa One’, sans-serif;
  margin: 15px 0;
  font-size: 1.75em;
  font-weight: normal;
  line-height: 0.8em;
}

h2 {
  font-size:0.75em;
  margin: -5px 0 0;
  font-weight: normal;
}

#footer {
  font-size: 0.75em;
  text-align: center;
  padding-top: 50px;
  color: #ccc;
}