<!DOCTYPE html>
<style>
.item {
margin: 10px;
margin-top: 20px;
padding: 10px;
background: green;
</style>
<div class="item" style="margin-top: 18px"></div>
<div class="item" style="opacity: 0.5; margin-top: 20px"></div>
</body>
<!DOCTYPE html>
<style>
.item {
margin: 10px;
margin-top: 20px;
padding: 10px;
background: green;
</style>
<div class="item" style="margin-top: 18px"></div>
<div class="item" style="opacity: 0.5; margin-top: 20px"></div>
</body>