styles.css

*,
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: inherit;
}

html{
    font-size: 62.5%;
}

body{
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f4f4;

    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;

}

.container{
    display: flex;
    padding: 2rem;
    margin: 0 auto;
    width: 80rem;
    max-width: 100%;
}

h1{
    font-size: 3rem;
    margin: 2rem 0;
}

aside{
    padding: 1rem 2rem;
    width: 25rem;
    border-right: 1px solid #111;
}

button{
    background-color: #fff;
    border: 1px solid #111;
    border-radius: .5rem;
    cursor: pointer;
    display: block;
    width: 100%;
    padding: 1rem;
    margin-bottom: 2rem;
    font-weight: 600;
    font-size: 1.4rem;
}

main{
    flex: 1;
    padding: 1rem 2rem;
}

h3,
h2{
    border-bottom: 1px solid #111;
    padding-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    font-weight: 300;
    margin: 0 0 2rem;
}

h3{
    background-color: #fff;
    padding: 1rem;
    margin: 2rem 0 0;
}

.person{
    display: flex;
    justify-content: space-between;
    font-size: 2rem;
    margin-bottom: 1rem;
}