<!DOCTYPE html>
<html>
<head>
<style>
html {
height: 100%;
}
body {
height: 100%;
}
img.normal {
height: auto;
}
img.big {
height: 50%;
}
img.small {
height: 10%;
}
</style>
</head>
<body>
<img class="normal" src="logocss.gif" width="95" height="84"><br>
<img class="big" src="logocss.gif" width="95" height="84"><br>
<img class="small" src="logocss.gif" width="95" height="84">
</body>
</html>