Medium Rectangle – 300 x 250

<div style="width: 300px; height: 250px; background: #428bca; color: #fff; line-height: 250px; text-align: center; ">
MEDIUM RECTANGLE</div>

Leaderboard – 728 x 90

<div style="width: 728px; height: 90px; background: #428bca; color: #fff; line-height: 90px; text-align: center; ">
LEADERBOARD</div>

Full Banner – 468 x 60

<div style="width: 468px; height: 60px; background: #428bca; color: #fff; line-height: 60px; text-align: center; "> FULL BANNER </div>

Mobile Banner – 320 x 50

<div style="width: 320px; height: 50px; background: #428bca; color: #fff; line-height: 50px; text-align: center; "> MOBILE BANNER </div>

Wide Skyscraper – 600 x 160

<div style="width: 160px; height: 600px; background: #428bca; color: #fff; line-height: 600px; text-align: center; "> SKYSCRAPER </div>