p {
    width: 20em;
    margin: 5em auto;
    padding: 5em;
    border: 1px solid;
    border-radius: 1em;
    text-align: center;
    font-size: 20px;

    /* Unprefixed gradient using final syntax */
    background: linear-gradient(90deg, red, orange, yellow, green, blue, indigo, violet);
}