Using Best Practise of CSS

Im I Using Now the Best practise of CSS?

css
body {

    background-color: #6495ED;
    font-family:  'Poppins';
}

header {

    text-align: center;
}

footer {

    color: #e0e0e0;
    background-color: #507FCC;
}

p {

    color: #f7f7f7;
    font-size: 1rem;
}

h1 {

    color: #ffffff;
    font-size: 3.5rem;
}

h2 {

    color: #f0f0f0;
}

h3 {

    color: #e0e0e0;
}

li {

    color: #f7f7f7;
}
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