.caja {
    width: 100px;
    height: 100px;
    border-style: solid;
    border-color: grey;
    border-width: 1px;
    background-color: rgb(12, 151, 243);
    border-radius: 50px 50px;
}
.caja2 {
    width: 300px;
    height: 100px;
    border-style: solid;
    border-color: grey;
    border-width: 1px;
    background-color: rgb(12, 151, 243);
    border-top-right-radius: 100px;
    border-top-left-radius: 20px;
    border-bottom-right-radius: 20px;
    border-bottom-left-radius: 100px;
}