.wrapper {
    width:70%;
}

.header {
    font-size:20px;
    margin:15px;
    padding:10px;
    background-color:darkorange;
}

.box {
    background-color:cadetblue;
    width: 200px;
    height: 200px;
    margin: 10px;
    border: solid 1px black;
}