#background{
  background-color : black;
  background-size: cover;
  border-color: white;
  border-style: solid;
  border-width: 1px
}

#square1{
  height : 600px;
  width : 700px;
  padding : 20px;
  background-color : red;
  border-width : 2px;
  border-style : solid;
  border-color : white;
  margin: auto;
}

#square2{
  height : 400px;
  width : 700px;
  padding : 20px;
  background-color : cyan;
  border-width : 2px;
  border-style : solid;
  border-color : white;
  margin: auto;
}

#square3{
  height : 550px;
  width : 700px;
  padding : 20px;
  background-color : yellow;
  border-width : 2px;
  border-style : solid;
  border-color : white;
  margin: auto;
}

#headercolour{
  color : red;
  text-align: center;
}

#images {
    white-space: nowrap;
}