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<style>
body {
margin: 0;
}
.row {
clear: both;
}
.row div {
float: left;
}
.red {
background-color: red;
}
</style>
<div class="row">
<div class="red" style="width: 200px">a</div>
<div style="width: 200px">a</div>
</div>
<div class="row">
<div class="red" style="width: 200px">a</div>
<div style="width: 200px">a</div>
</div>
<div class="row">
<div class="red" style="width: 100px">a</div>
<div style="width: 300px">a</div>
</div>
<div class="row">
<div class="red" style="width: 100px">a</div>
<div style="width: 300px">a</div>
</div>