body,
html {
    padding: 0;
    margin: 0;
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        Segoe UI,
        Roboto,
        Oxygen,
        Ubuntu,
        Cantarell,
        Fira Sans,
        Droid Sans,
        Helvetica Neue,
        sans-serif;
    line-height: 1.6;
    font-size: 18px;
    background-color: #fff;
}
* {
    box-sizing: border-box;
}
img {
    width: 90vw;
    height: auto;
    max-width: 500px;
    margin: auto;
}