<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.box11 {
300px;
height: 100px;
background: #ccc;
border-radius: 10px;
margin: 10px;
}
.shadow {
position: relative;
max- 270px;
box-shadow: 0px 1px 4px rgba(0,0,0,0.3), 0px 0px 20px rgba(0,0,0,0.1) inset;
}
.shadow::before, .shadow::after {
content: "";
position: absolute;
z-index: -1;
}
.shadow::before, .shadow::after {
content: "";
position: absolute;
z-index: -1;
bottom: 15px;
left: 10px;
50%;
height: 20%;
}
.shadow::before, .shadow::after {
content: "";
position: absolute;
z-index: -1;
bottom: 15px;
left: 10px;
50%;
height: 20%;
box-shadow: 0 15px 10px rgba(0, 0, 0, 0.7);
transform: rotate(-3deg);
}
.shadow::after {
right: 10px;
left: auto;
transform: rotate(3deg);
}
</style>
</head>
<body>
<div class="box11 shadow"></div>
</body>
</html>
