.simple-duo{
    display: grid;
    grid-template-columns: 1fr 1fr;
    margin: 0 0.5rem;
    border: 2px solid #000;
}
.select-cent{
    width: 100%;
}

.simple-duo1, .simple-duo2{
    margin: auto 0;
    padding: 0.5rem;
}
.simple-duo2{
    border-left: 2px groove #ff8601;
}

.Choisissez-un-numro{
    font-size: large;
    font-weight: bold;
    margin: 0;
}

.coeur{
    color: #ff8601;
}

@media screen and (max-width: 450px){
    .simple-duo{
        display: flex;
        flex-direction: column;
        margin: 0 0.5rem;
        padding: 0.5rem;
        border: 2px solid #000;
    }
    
    .simple-duo2{
        border: 0;
        border-top: 2px groove #ff8601;
    }

}