karnov.club/styles.css

html, body {
    background-color: #fdfdfd;
    margin: 0; 
    font-family: 'Open Sans', sans-serif; 
    font-size: 18px;
}

main {
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

main p { line-height: 1.5; }

main > * {
    width: 50%;
    max-width: 500px;
}

img { width: 100%; }

h1 { text-align: center; }

main > section > figure {
    display: flex;
    align-items: center;
    justify-content: center;
}

a { font-weight: bold; }

strong, a, hr { color: #a25c29; }

hr { border-style: dashed; }

@media only screen and (max-width: 600px) {
    main {
        height: 100vh;
        width: 100vw;
        display: flex;
        align-items: center;
        flex-direction: column;
        justify-content: normal;
    }

    main > * {
        width: 80%;
    }
}