app.css

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

:root {
    font-size: 10px;
    font-family: Montserrat, sans-serif;
}

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

#discount-featured {
    width: 100%;
    height: 60px;
    background-color: #181818;
    display: flex;
    color: #F9F9F9;
    justify-content: center;
    align-items: center;
    font-size: 1.6rem;
    font-weight: 500;
}

#logo-centered {
    width: 100%;
    height: 60px;
    background-color: #F9F9F9;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #181818;
    font-size: 2.4rem;
    font-weight: 500;
}

.opacity-rec {
    width: 100%;
    height: 378px;
    background: #181818;
    opacity: 0.6;
    position: absolute;
}

#banner-img {
    width: 100%;
    height: 378px;
    display: flex;
    align-items: center;
    background-color: #181818;
    background-image: url(imgs/Air-Jordan-1-Retro-High-OG-Wmns-TWIST-Feminino\ 1\ banner.png);
    background-position: center;
    color: #F9F9F9;
    font-size: 1.8rem;
    font-weight: 600;
}

#h1-banner {
    font-size: 2.4rem;
    padding-bottom: 19px;
    font-weight: 700;
    height: 39px;
}

#text-space {
    position: absolute;
    padding-left: 100px;
    max-width: 600px;
}

/* main content */

#main-content-featured {
    padding-top: 58px;
    width: 100%;
    background-color: #F9F9F9;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 3.2rem;
    font-weight: 600;
    color: #181818;
}

#sub-h1 {
    padding-top: 10px;
    font-size: 1.8rem;
    display: flex;
    font-weight: 500;
    justify-content: center;
    align-items: center;
    color: #474747;
}

#store-items {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    flex-wrap: wrap;
    margin-bottom: 100px;
}

.square {
    width: 20%;
    margin: calc(20%/16);
    height: 302px;
    background-color: #EBE9EA;
    display: flex;
    justify-content: center;
    align-items: center;
}

.square>img:hover {
    transform: scale(1.15);
}

footer {
    width: 100%;
    height: 60px;
    background-color: #181818;
    display: flex;
    align-items: center;
    justify-content: center;
}

footer>p {
    color: #F9F9F9;
    font-size: 1.8rem;
    font-weight: 500;
}

/* responsivo */

@media screen and (max-width: 1280px) {
    #discount-featured {
        width: 100%;
        font-size: 1.6rem;
        font-weight: 600;
    }

    #logo-centered {
        width: 100%;
    }

    #banner-img {
        width: 100%;
        font-size: 1.6rem;
        height: 377px;
        justify-content: center;
    }

    #h1-banner {
        font-size: 2.8rem;
        padding-bottom: 12px;
    }

    #text-space {
        padding-left: 20px;
    }

    #main-content-featured {
        font-size: 2.8rem;
    }

    #sub-h1 {
        padding-top: 5px;
        font-size: 1.6rem;
        text-align: center;
    }

    #store-items {
        flex-direction: column;
        width: 100%;
    }

    .square {
        width: 90%;
    }
}