styles.css

* {
    padding: 0;
    margin: 0;
}

html, body {
    height: 100%;
    width: 100%;
    font-family: "Helvetica-Neue", Helvetica, sans-serif;
}

body {
    background: #ed4853;
    color: #fff;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
}

img {
    display: block;
}

.wrapper {
    max-width: 1100px;
    width: 100%;
    margin: 20px auto;
}

h1 {
    font-size: 26px;
}

a {
    color: #fff;
}

main {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    -ms-flex-line-pack: center;
        align-content: center;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    justify-content: center;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    margin: 0 20px 70px;
}

.img-screenshot {
    max-width: 400px;
    width: 100%;
    border: 5px solid #fff;
    border-radius: 5px;
}

.main-link {
    display: block;
    margin-top: 20px;
}

footer {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    font-size: 12px;
    margin: 0 20px;
}

main div, .img-screenshot {
    margin: 0 30px;
}

@media screen and (max-width: 1070px) {
    main {
        margin-bottom: 30px;
    }
    main div {
        margin: 10px 0;
    }

    body {
        -webkit-box-align: start;
            -ms-flex-align: start;
                align-items: flex-start;
        -webkit-box-pack: start;
            -ms-flex-pack: start;
                justify-content: flex-start;
    }

    footer p {
        margin-bottom: 10px;
    }
}