html {
    font-size: 62.5%; /* 16px * 62.5% = 10px */
}

body {
    margin: 0;
    font-size: 1.6rem;
    font-family: Arial, sans-serif;
    background-color: whitesmoke;
    color: #222;
    line-height: 1.6;
}

.wrapper {
    width: 90%;
    max-width: 90rem;
    margin: 0 auto;
}

.header {
    background-color: lightblue;
    padding: 3rem 2rem;
    margin-top: 2rem;
    border-radius: 0.8rem;
}

.layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
    align-items: start;
}

.main-content {
    margin-top: 0;
}

.sidebar {
    margin-top: 0;
}

.box {
    background-color: white;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 0.8rem;
}

.content-block {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: lavenderblush;
    border-radius: 0.6rem;
}

h1 {
    margin-top: 0;
    font-size: 3.2rem;
}

h2 {
    margin-top: 0;
    font-size: 2.4rem;
}

h3 {
    margin-top: 0;
    font-size: 1.8rem;
}

.footer {
    text-align: center;
    padding: 2rem;
    margin-bottom: 2rem;
    background-color: cornsilk;
    border-radius: 0.8rem;
}