body{
    margin: 0;
}
*{
    box-sizing: border-box;
}
body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #d8d8d8;
}
.container {
    width: 960px;
    margin: 0 auto;
    background: #b9b9b9;
    padding: 20px;
}
.box {
    margin-bottom: 20px;
    padding: 15px;
    background: #ffffff;
    border: 1px solid #ccc;
    border-radius: 5px;
}