body{background-color:black;}
h1{color: white;}
h1.class1{font-size:16px;}
h1.class2{font-size:20px;}
h1.class3{font-size:50px;}
h2.class1{color:black; font-size:16px;}
h2.class2{color:black; font-size:20px;}
h2.class3{color:black; font-size:50px;}

#hidari{background-color:black; widht:300px; height:200px; float:left; overflow:auto;}
#mannaka{background-color:red; widht:300px; height:200px; float:right; overflow:auto;}
#largehidari{background:#00c0c0; widht:600px; height:400px; float:left; overflow:auto;}
#migi{background-color:blue;  widht:300px; height:200px;float:right; overflow:auto;}