html {
    background-color: #e3bebeff;
}

body {
    max-width: 800px;
    margin: auto;
}

img {
    max-width: 800px;
    margin: auto;
}

.pic {
    width: 100%;
    text-align: center;
    margin-top: 3em;
    margin-bottom: 3em;
}

#header {
    margin: auto;
    display: block;
}

@media screen and (max-width: 800px) {
    body {
        margin: 0;
    }

    img {
        max-width: 100vw;
    }
}