Quête 06 - CSS : box model

<!DOCTYPE html>
<html lang="fr">
    <head>
        <meta charset="UTF-8">
        <title>Find the precious!</title>
        <link rel="stylesheet" href="style.css">
        <link href="https://fonts.googleapis.com/css?family=PT+Sans&display=swap" rel="stylesheet">
    </head>
    <body>
        <nav>
            <ul>
                <li>FindThePrecious.com</li>
                <li>Fellows</li>
                <li>Contact us</li>
            </ul>
        </nav>
        <section>
            <div class="carousel"></div>
        </section>
        <section class="fellows">
            <h2><span>Fellows wanted dead</span> (or alive if you want to eat them later)</h2>
        </section>
        <section class="target">
            <article></article>
            <article></article>
            <article></article>
        </section>
        <hr>
        <form>
            <h2>Contact us</h2>
            <input type="email" placeholder="@">
            <input type="text" placeholder="&#8962;">
            <input type="text" placeholder="I have seen one of them">
            <textarea placeholder="Your message" rows="5"></textarea>
        </form>
    </body>
</html>

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*{
    padding: 0;
    margin: 0;
}
body {
    font-family: 'PT Sans', sans-serif;
    color: rgb(150 , 150, 150);
    margin: 10px 5px;
}
nav {
    background-color: rgb(44, 44, 44);
    font-weight: bold;
}
nav ul {
    display: flex;
    list-style: none;
    align-items: center;
}
nav ul li {
    padding: 10px;
    line-height: 20px;
}
ul li:first-child{
    font-size: 20px;
}
.carousel {
    height: 200px;
    background-color: rgb(235 , 235, 235);
}
.fellows {
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.fellows h2 {
    font-size: 20px;
}
.fellows h2 span {
    font-size: 30px;
}
.target {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}
.target article {
    width: 400px;
    height: 500px;
    background-color: rgb(235 , 235, 235);
}
hr {
    margin: auto;
    margin-top: 150px;
    margin-bottom: 10px;
    border: 1px rgb(44, 44, 44) solid;
    width: 95%;
}
form {
    height: 300px;
    display: flex;
    flex-direction: column;
    align-content: space-around;
}
form h2 {
    margin-left: 30px;
    margin-bottom: 30px;
    font-size: 30px;
}
form input {
    height: 20px;
}
form input, textarea {
    width: 80%;
    margin: auto;
    border: 1px solid black;
    padding: 5px;
}
form input:nth-child(4) {
    border: 1px solid rgb(150 , 150, 150);
    border-radius: 5px;
}

/*animations*/

nav li:hover {
    padding: 9px;
    background-color: rgb(235 , 235, 235);
    border: 1px solid rgb(150 , 150, 150);
}