h1 {color: #000000}
h1 {text-align: center}
h1 {font-size: 135%}
h2 {color: #000000}
h2 {text-align: left}
h2 {font-size: 120%} 
h3 {color: #000000}
h3 {text-align: left}
h3 {font-size: 115%}
h4 {color: #000000}
h4 {text-align: center}
h4 {font-size: 110%} 
body {background-color: white}