stretch;
绝对定位对齐
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.one {
background-color: red;
position: absolute;
left: 0;
width: 300px;
height: 100px;
}
.two {
left: 300px;
right: 300px;
background-color: blue;
position: absolute;
height: 100px;
}
.three {
right: 0px;
width: 300px;
background-color: yellow;
position: absolute;
height: 100px;
}
</style>
</head>
<body>
<div class="father">
<div class="one">1</div>
<div class="two">1</div>
<div class="three">1</div>
</div>
</body>
</html>