* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    -webkit-user-select: none;
    /* Safari */
    -ms-user-select: none;
    /* IE 10 and IE 11 */
    user-select: none;
    /* Standard syntax */
    padding: 20px;
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
}