*, *::before, *::after {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #333333;
    background-color: #fff;
}

    body > header {
        text-align: center;
    }

    body > main {
        min-height: 100vh;
    }

    body > footer {
        text-align: center;
    }