Tea Cozy - code review request

Hey all,

Have just finished the tea cozy project and would appreciate some feedback on my code. I have a few things in mind already, so interested to hear what you have to say…

Many thanks in advance.

Tez Cozy
<!--Mission Banner section-->
<main>
    <div id="banner">
        <div class="bannerText">
            <h2>Our Mission</h2>
            <h4>Artisanally crafted, organic teas</h4>
        </div>
    </div>
</main>
<!--End Mission Banner section-->

<!--Tea of the Month section-->
<div id="teaofthemonth">
    <div class="bannerText">
        <h2>Tea of the Month</h2>
        <h4>What's steeping at the Tea Cozy?</h4>
    </div>
    <div class="teaOTM">
        <img src="Resources/Img/img-berryblitz.jpg">
        <h4>Fall Berry Blitz Tea</h4>
    </div>
    <div class="teaOTM">
        <img src="Resources/Img/img-berryblitz.jpg">
        <h4>Fall Berry Blitz Tea</h4>
    </div>
    <div class="teaOTM">
        <img src="Resources/Img/img-berryblitz.jpg">
        <h4>Fall Berry Blitz Tea</h4>
    </div>
    <div class="teaOTM">
        <img src="Resources/Img/img-berryblitz.jpg">
        <h4>Fall Berry Blitz Tea</h4>
    </div>
    <div class="teaOTM">
        <img src="Resources/Img/img-berryblitz.jpg">
        <h4>Fall Berry Blitz Tea</h4>
    </div>
</div>
<!--End Tea of the Month section-->

<!--Locations Section-->
<div id="locationBanner">
    <h2>Locations</h2>
    <div class="locationDetails">
        <h3>Downtown</h3>
        <p>384 West 4th St</p>
        <p>Suite 108</p>
        <p>Portland, Maine</p>
    </div>
    <div class="locationDetails">
        <h3>Downtown</h3>
        <p>384 West 4th St</p>
        <p>Suite 108</p>
        <p>Portland, Maine</p>
    </div>
    <div class="locationDetails">
        <h3>Downtown</h3>
        <p>384 West 4th St</p>
        <p>Suite 108</p>
        <p>Portland, Maine</p>
    </div>
</div>
<!--End Locations Section-->

<!-- Begin Contact Section-->
<section class="contact">
    <h2>The Tea Cozy</h2>
    <h5>[email protected]</h5>
    <h5>000-000-0000</h5>
</section>
<!-- End Contact Section-->

<!-- Begin Footer-->
<footer>
    <p><strong>copyright The Tea Cozy 2017</strong></p>
</footer>
body {
    font-family: Helvetica, sans-serif;
    font-size: 22px;
    color: seashell;
    background-color: black;
    opacity: 0.9;
}

nav {
    display: flex;
    justify-content: space-around;
    width: 100%;
    min-height: 69px;
    padding-left: 10px;
    padding-right: 10px;
    border-bottom: 1px solid seashell;
}

#teaCozy {
    height: 50px;
}

nav li {
    text-decoration: underline;
    display: inline-block;
    list-style: none;
    margin-left: 20px;
}

nav li a {
    color: seashell;
}
#banner {
    background-image: url(Resources/Img/img-mission-background.jpg);
    background-repeat: no-repeat;
    background-size: auto;
    background-position: center;
    height: 700px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.bannerText {
    background-color: black;
    width: 100%;
    text-align: center;
}

#teaofthemonth {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-evenly;
    margin-bottom: 100px;
}

.teaOTM {
    text-align: center;
}

.teaOTM img {
    display: inline-flex;
    max-width: 300px;
}

.teaOTM h4 {
    margin-top: 10px;
    padding: 0px;
}

#locationBanner {
    background-image: url(Resources/Img/img-locations-background.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    flex-basis: 500px;
    min-height: 500px;
    display: flex;
    flex-flow: row wrap;
    gap: 40px 15px;
    padding: 40px;
    justify-content: space-around;
    align-items: center;
}

#locationBanner h2 {
    text-align: center;
    margin: 0px;
    width: 100%;
}

.locationDetails {
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
    width: 300px;
    height: 300px;
    margin: 0px;
    background-color: black;
    opacity: 1;
}

.contact {
    text-align: center;
    max-height: 200px;
}

footer {
    margin-top: 20px;
    text-align: left;
}