dding: 0 }

body { width: 400px; border: medium solid; }
span { display: block; overflow: hidden; width: 100px; height: 50px; background: aqua; }

</style>
</head>
<body>

<div style="float: left; width: 250px; height: 75px;"></div>
<div style="float: right; width: 250px; height: 75px;"></div>
<span></span>
<span></span>



</body></html>