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HTML How to Make a Website Adding Pages to a Website Add and Style Icons

Error when trying to set background-size to 20px

Whenver I try to recheck to finish this task I get the error to check that I set the background-size to 20px, please help!

css/main.css
a {
  text-decoration: none;
}

#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;
}

img {
  max-width: 100%;
}

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

#gallery li {
  float: left;
  width: 45%;
  margin: 2.5%;
  background-color: #f5f5f5;
  color: #bdc3c7;
}

nav ul {
  list-style: none;
  margin: 0 10px;
  padding: 0;
}

nav li {
  display: inline-block;
}

nav a {
  font-weight: 800;
  padding: 15px 10px;
}

.profile-photo {
  display: block;
  margin: 0 auto 30px;
  max-width: 150px;
  border-radius: 100%;
}

.contact-info {
  font-size:0.9em;
  margin:0;
  padding:0;
  list-style:none;
}

ul.contact-info li a {
  display:block; 
  min-height:20px;
  background-repeat:no-repeat;
  background-size:20px;
  padding-left:30px;
  padding-right:0;
  padding-top:0;
  padding-bottom:0;
}

The questions asks you to set the background to 20px square, to do this you simply have to add an extra value to background size.

background-size: 20px 20px;