* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-user-select: none; /* Chrome/Safari */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* IE10+ */
    /* Rules below not implemented in browsers yet */
    -o-user-select: none;
    user-select: none;
}

html, body {
    height: 100%;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
    height: 100vh;
}