popup.css

#firstpopup{
    display: none;
}
.bck {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    background-color: blue;
    position: absolute;
    z-index: 300;
    position: fixed;
    transform: translate(-50%, -50%);
    opacity: 50%;
    left: 50%;
    top: 50%;
}

.mainpopup {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    position: absolute;
    z-index: 300;
    position: fixed;
    transform: translate(-50%, -50%);
    left: 50%;
    top: 50%;
}

.mainpopup_inside {
    width: 10cm;
    padding: 15px 30px;
    height: auto;
    border-radius: 10px;
    background-color: white;
}

.mainpopup_inside_img {
    margin-bottom: 10px;
    display: grid;
    place-items: center;
    font-size: 1.3rem;
    font-weight: 600;
    font-family: system-ui;
    letter-spacing: 2px;
}

.mainpopup_inside_buttons {
    font-size: 1.2rem;
    font-weight:600;
    border: 1px solid black;
    border-radius: 10px;
    padding: 7px 15px;
    font-family: poppins;
    cursor: pointer;
}