.modal{
    position: fixed;
    top: 20%;
    left: 5%;
    width: 90%;
    background-color: white;
    padding: 1rem;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    display: none;
}

#backdrop{
    position:fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    display: none;
}

@media(min-width:48rem){
    .modal{
        left: calc(50% - 20rem);
        width: 40rem;
    }
}