.rectangle{
    width:400px;
    height:300px;
    border-radius:50px;
    background-color:#4169E1; /*blue */
    transition: background 0.8s;
}


.good{
     background-color:#32CD32; /*limegreen */
}


.important{
    background-color:#B22222; /*firebrick */
}


.vide{
     display:none;
}
p{
    color:red;
}