Webleb - fragmentos de código - Sistema de inicio de sesión HTML y CSS

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="loginsystemstyle.css">
    <link rel="stylesheet" href="bootstrap-icons-1.11.3">
    <link rel="stylesheet" href="fontawesome-free-6.7.2-desktop/otfs/Font Awesome 6 Brands-Regular-400.otf">
    
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css">
    <title>Login System</title>
</head>
<body>
    <div class="subContainer">
            <ul class="unorderedcont">
                <li class="listContainer"><a href="">Home</a></li>
                <li class="list2Container"><a href="">About Us</a></li>
                <li class="list3Container"><a href="">Contanct Us</a></li>
                <li class="list4Container"><a href="">Login</a></li>
            </ul>
    </div>
    <div class="mainContainer">
        <div class="loginmainCont">
            <h3>Please Enter Your details to Login</h3>
            <input type="email" name="email" id="email" placeholder="Email">
            <input type="password" id="pswd" placeholder="Password">
            <br>
            <button type="button" value="submit" id="button"><i class="fa fa-"></i> Login</button>
        </div>
    </div>
</body>
</html>

body{
    background-color:rgb(255, 255, 255);
    margin: 0;
}
.subContainer{
    background-color: #1e5470;
    display: flex;

}
ul{
    display: flex;
}

li{
    padding: 0px;
    margin: 0;
    list-style-type: none;
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;

}

li a{
    text-decoration: none;
    font-size: 18px;
    color: #fff;
    padding: 16px;
    margin: 4px;
}

a:hover{
    background-color: #eed3f6;
    color: #1e5470;
}

.mainContainer{
    margin: 60px auto;
    background-color: #1e547023;
    width: 340px;
    border: 1px solid #1e547023;
    border-radius: 10px;
    box-shadow: 1px solid rgba(19, 19, 19, 0.3);
    
}
.loginmainCont{
    padding: 30px 20px;
}
.unorderedcont{
    margin: 18px 4px;
}

#email{

}

#pswd, #email{
    width: 260px;
    margin: 5px;
    padding: 12px 16px;
    border:1px solid #1e5470;
    border-radius: 20px;

}
#button{
    width: 290px;
    margin: 26px 0;
    padding: 14px 4px;
    font-family: 'Times New Roman', serif;
    font-size: 16px;
    background-color: #1e5470;
    color: #fff;
    border: 0 solid #1e5470;
    border-radius: 6px;
}

i{
    padding: 6px;
    font-size: 16px;
    color: #fff;
}
h3{
    color: #1e5470;
}

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