On one of the CSS challenges in the build a website course, the task is to select the gallery, and remove margins, padding and bullet points. I thought I had it, but I keep getting a message saying at least one of my side has no margins, but I need to remove the margins on all sides...Here is my code below, I hope someone knows where I'm going wrong, this is really frustrating!

a { text-decoration: none; }

img { max-width:100%; }

wrapper {

max-width: 940px; margin: 0 auto; }

logo {

text-align: center; margin: 0; }

h1, h2 { color: #fff; }

nav a { color: #fff; }

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

h1 { font-family: Changa One, sans-serif; font-size: 1.75em; font-weight: normal; }

gallery {

margin: 0, 0; padding: 0; list-style-type: none; }

a {
  text-decoration: none;
}

img {
  max-width:100%;
}

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

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

h1, h2 {
  color: #fff;
}

nav a {
  color: #fff;
}

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

h1 {
  font-family: Changa One, sans-serif;
  font-size: 1.75em;
  font-weight: normal;
}

# gallery {
  margin: 0, 0;
  padding: 0;
  list-style-type: none;
}