body {
    background-color: lightyellow;
}
h1 {
    text-align: center;
    background-color: yellow;
    color: blue;
    }

h2 {
    text-align: center;
    font-style: italic;
    }
h3 {
    color: red;
    text-decoration: underline;
    }

.indicator {
    color: red;
}

.row {
    color: green;
}

#mail {
    text-align: center;
}

.obl {
    color: green;
}