body {
  background-image: url(https://cedasart.neocities.org/sunsetbackground.png);
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  }  

img {
  display:block;
  margin:auto;
}

.container {
margin: 50px;
padding: 30px;
}

#mainheader {
  width: 100%;
  height: 100%;
}

#leftnav{
  background-color: rgba(98, 236, 248, 0.33);
  color: white;
  width: 20%;
  height: 600px;
  box-sizing: border-box;
  float: left;
}

#centerbody{
  background-color: rgba(98, 236, 248, 0.33);
  color: white;
  width: 60%;
  height: 600px;
  
  float: left;
}

#rightnav {
  background-color: rgba(98, 236, 248, 0.33);
  color: white;
  width: 20%;
  height: 600px;
  float: left;
}