body {
  background-image: url('../images/studyBuddy.png');
  background-size: cover;
  background-position: center 10px;
  background-repeat: no-repeat;
  background-attachment: fixed;
  margin: 0;
  padding: 0;
  background-color: lightgrey;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #808080;
    position: relative;
    z-index: 2;
  }
  
  li {
    float: left;
  }
  
  li a {
    display: block;
    color: white;
    text-align: center;
    padding: 16px 16px;
    text-decoration: none;
  }
  
  li a:hover {
    background-color: #4c4646;
  }