Just change the float property to right or left for the child div and display property to inline-block for the parent div, see the example below
<div style="width: 960px; position: relative; display: inline-block;">
<div style="width: 320px; float: right; background-color:
#00FFFF;">
<br />
Mohammad
<br />
</div>
<div style="width: 320px; float: right; background-color:
#C0C0C0;">
<br />
Mohammad
<br />
</div>
<div style="width: 320px; float: right; background-color:
#008080;">
<br />
Mohammad
<br />
</div>
</div>
