div {
    border:4px solid lightblue;
    }
#block {
    display:block;
    }
#inline {
    display:inline;
}
#main {
    width:300px;
    margin: auto;
}
#max-width{
    max-width:300px;
}
#box {
    width:400px;
    height:200px;
    margin: 10px;
    padding: 5px;
    border: 2px dashed lightblue;
}