h1 {
    background: #00d487;
    color: black;
    padding: 20px;
    margin: 0;
    text-align: center;
    font-size: 60px;
    }
    p {
    text-align: center;
    font-size: 16px;
   
    margin: 9px;
    }
    #principal {
        width: 700px;
        margin: auto;
        ;
    }