body{
font-size:1em;
}

#a{
float: left;
font-size:10em;
line-height:0.75em;
}

#b{
float: left;
font-size:2em;
line-height:0.75em;
}

#c{
float: left;
font-size:3em;
}

#d{
float: left;
font-size:4em;
line-height:0.75em;
}