/* Jello Layout */
body {
  width: 80%;
  margin: 0 auto;
  background-color: darkgreen;
  font-family: sans-serif;
}

/* Element selector */
h1 {
  color: darkblue;
  text-align: center;
}

/* Class selector */
.intro {
  color: green;
  background-color: #e0ffe0;
  padding: 10px;
}

/* Another class selector */
.content-box {
  background-color: #fff0f0;
  padding: 15px;
  border: 1px solid #ccc;
}

/* ID selector */
#main-title {
  font-size: 2em;
}

#footer {
  text-align: center;
  font-style: italic;
  margin-top: 30px;
}