body > div > section {
    overflow: hidden;
    clear: both;
    margin-left: auto;
    margin-right: auto;
    
}

section.gray {
    background-color: #f3f3f3;
}

section > .middle, header > .middle, footer > .middle {
    margin: 0 auto;
    max-width: 1380px;
    overflow: hidden;
    clear: both;
}
section > .middle.wider{
	max-width: 1560px;
}

section > .middle > .margin, header > .middle > .margin {
    margin: 0 30px;
    overflow: hidden;
    clear: both;
}

@media screen and (max-width: 500px),(max-height: 600px) {
    section > .middle > .margin, header > .middle > .margin {
        margin: 0 20px;
    }
}