body {
    margin: 0;
    color: gray;
}

* {
    box-sizing: border-box;
    font-family: sans-serif;
}

.container {
    width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

@media screen and (max-width: 1000px) {
    .container {
        width: 100%;
        padding-left: 10px;
        padding-right: 10px;
    }
}